Data Insights Hour 17 of 24

Multi-Source Reasoning (MSR)

Synthesize information across multiple tabs to answer complex inference questions.

Crash Course Progress 17 / 24 Hours Complete
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What You'll Learn This Hour

Core Concepts: MSR Fundamentals

Tab Format

MSR presents 2-3 clickable tabs. Each tab may be an email, table, report excerpt, chart, or memo. You must read ALL tabs before answering any question.

Question Types

Three main types: Inference (what follows from the data?), Explanation (which resolves the discrepancy?), and Must-Be-True (which is definitely supported?).

Synthesis Strategy

Read Tab 1 fully. Read Tab 2 while noting what agrees, what contradicts, and what fills gaps from Tab 1. Same for Tab 3. Build a mental "unified picture" before questions.

Key MSR Patterns

Complementary Sources

Each tab covers a different aspect. Tab 1 gives revenue; Tab 2 gives costs; Tab 3 gives headcount. You must combine all three to answer a profit-per-employee question.

Contradictory Sources

Tabs may conflict intentionally. An email may claim sales rose 10%, while the table shows a 5% drop. Questions often ask you to identify or resolve the contradiction.

Different Time Periods

One tab may cover Q1, another Q3. Do not assume data from different periods is directly comparable — a common trap on GMAT MSR questions.

Scope Differences

Tab 1 may cover all divisions; Tab 2 may cover only one region. The GMAT frequently traps students who ignore these scope distinctions.

MSR Interface: Visual Overview

Email Table Report From: Sarah Chen, VP Sales To: Executive Team Re: Q3 Revenue Performance North region: +18% vs Q2. Overall sales headcount grew by 12 to reach 87 reps. However, West region underperformed by approx. 7% against quota targets. Tab 1 of 3 — Email Reconcile sources Question Prompt Based on the Email (Tab 1) and the Table (Tab 2), which of the following best explains the discrepancy between reported sales growth and the revenue figure shown for the West region? (A) The email includes returns in revenue (B) The West region uses a different fiscal Q (C) Headcount data covers all regions (D) The table excludes Q1 figures (E) North region offset West shortfall MSR Strategy Checklist Step 1: Read ALL tabs completely before looking at questions Step 2: Note what each tab covers (topic, time period, scope) Step 3: Identify agreements and contradictions between tabs Step 4: Check which tab(s) each question references

The active tab (Email) is highlighted. The question box references two tabs and asks you to reconcile a discrepancy — a classic MSR pattern.

Worked Examples: Step-by-Step Solutions

WORKED EXAMPLE 1 — Inference Question

Tab 1: Email

VP Operations writes that NovaTech's total headcount is 340, with 120 in Engineering and the remainder split equally between Sales and Admin.

Tab 2: Revenue Table

Annual revenue: $42M. Engineering division contributed $28M. Sales division contributed $14M. Admin is a cost center (no revenue).

Tab 3: Report

Industry benchmark: engineering revenue per head of $220K is considered strong. Companies below $180K are flagged as underperforming.

Question: Which of the following can be inferred from the three tabs?

(A) NovaTech's engineering division underperforms the industry benchmark.  (B) NovaTech's sales headcount is 110.  (C) NovaTech's engineering revenue per head exceeds the strong benchmark.  (D) Admin headcount is larger than Sales.  (E) Total revenue per employee is higher in Sales than in Engineering.

Solution — Correct Answer: (C)

Step 1 — Extract numbers. Tab 1: 340 total, 120 in Engineering. Remainder = 340 − 120 = 220, split equally: 110 Sales, 110 Admin.

Step 2 — Calculate engineering revenue per head. Tab 2: Engineering revenue = $28M. Headcount = 120. $28M / 120 = $233,333 per head.

Step 3 — Compare to benchmark. Tab 3: Strong = $220K. NovaTech = $233K. Exceeds strong benchmark. (C) is confirmed.

Eliminate traps: (A) is false — $233K exceeds $220K. (B) is correct arithmetic (110) but the question says "can be inferred" and (C) uses all three tabs more completely. (D) is false — both are 110. (E) Sales = $14M/110 = $127K; Engineering = $233K — false.

WORKED EXAMPLE 2 — Explanation Question

Tab 1: Manager Email

Region Manager reports Q4 sales of $9.2M, an increase of 15% over Q3, crediting a successful product launch and expanded sales team.

Tab 2: Finance Table

Q4 booked revenue for the region: $7.8M. Q3 revenue: $8.0M. Note: "Booked revenue excludes deals pending contract signatures as of Dec 31."

Question: The manager claims a 15% increase; the table shows a decline. Which best explains the discrepancy?

(A) The manager inflated figures to secure a bonus.  (B) Some Q4 deals were not yet signed by Dec 31 and are excluded from booked revenue.  (C) Q3 revenue in the table is incorrectly stated.  (D) The manager's region uses a different currency.  (E) The product launch generated returns, not net revenue.

Solution — Correct Answer: (B)

The discrepancy: Manager says +15% vs Q3. Table shows $7.8M (Q4) vs $8.0M (Q3) — a decline. Both use the same region and same quarter. This is a genuine contradiction that needs resolution.

Key note in Tab 2: "Booked revenue excludes deals pending contract signatures as of Dec 31." If significant deals closed in Q4 but contracts were unsigned by Dec 31, manager counts them (closed deals), finance excludes them (not booked). This perfectly explains the gap.

Eliminate: (A) is speculation — no evidence of dishonesty; GMAT will not choose this without explicit evidence. (C) attacks data quality without evidence. (D) currency difference is never mentioned. (E) is unrelated to the timing distinction that Tab 2 explicitly notes.

WORKED EXAMPLE 3 — Must-Be-True Question

Tab 1: Email

CEO states every product category achieved positive margin in FY2024. The company has three categories: Hardware, Software, and Services.

Tab 2: Income Table

FY2024 total revenue: $85M. Total costs: $74M. Net income: $11M. No category breakdown provided.

Tab 3: Report

Software category revenue grew 40% YoY. Hardware revenue was flat. Services revenue declined 5%.

Question: Which of the following must be true based on the three tabs?

(A) Software is the largest revenue category.  (B) Hardware costs declined in FY2024.  (C) The company had positive net income in FY2024.  (D) Services lost money in FY2024.  (E) Hardware margin is lower than Software margin.

Solution — Correct Answer: (C)

Must-be-true requires certainty from the tabs — not possibility or probability. Tab 2 directly states: Revenue $85M, Costs $74M, Net income $11M. Net income is positive. (C) is definitively true.

Eliminate carefully: (A) — Tab 3 says Software grew 40% but does not give absolute figures; we cannot determine if it is largest. (B) — Tab 2 gives total costs only; we cannot split by category. (D) — Tab 1 says ALL categories had positive margin, so Services must be profitable despite declining revenue. (E) — no margin data by category is provided.

Trap awareness: (D) is a very tempting wrong answer. Students confuse "revenue declined" with "lost money." Tab 1 explicitly refutes this by stating all categories had positive margin.

GMAT Traps to Avoid

Trap 1: Assuming All Tabs Agree

MSR deliberately introduces conflicts between sources. An email from a manager may contradict a financial table. Never assume consistency — verify each claim against each tab explicitly.

Trap 2: Using Outside Knowledge

MSR is closed-world: only information explicitly stated in the tabs counts. Even if you know that typical SaaS margins are 70%, you cannot use that unless a tab states it. Stick strictly to what is given.

Trap 3: Wrong Tab for the Question

Each question specifies which tab(s) are relevant ("Based on Tab 1 and Tab 2..."). Do not drag in Tab 3 data. Many wrong answers are constructed to seem right only if you use information from the wrong tab.

Trap 4: Confusing "Could Be True" with "Must Be True"

Must-be-true requires certainty from the data. Could-be-true only requires consistency. The GMAT routinely offers attractive "could be true" choices on must-be-true questions. Demand proof, not possibility.

Practice Questions

Three MSR sets (4 questions each = 12 questions total). All based on NovaTech Inc. data across three tabs.

MSR Set 1 — Source Tabs

Tab 1: Email from CFO

NovaTech's total annual revenue for FY2025 was $120M — up from $96M in FY2024. Operating costs rose from $70M to $78M. The company employs 480 people total.

Tab 2: Employee Data Table

Division breakdown: Engineering 200 employees, Sales 160 employees, Admin 120 employees. Average annual salary across all divisions: $85,000.

Tab 3: Manager Report

Sales division closed 1,200 deals in FY2025, averaging $75,000 per deal. Engineering launched 3 new products. Admin costs represent 18% of total operating costs.

1

Based on Tabs 1 and 2, what was NovaTech's operating income (revenue minus operating costs) per employee in FY2025?

(A) $45,833   (B) $87,500   (C) $250,000   (D) $176,667   (E) $135,000

Show Answer

Correct Answer: (A) $45,833

Tab 1: Revenue $120M, Operating costs $78M. Operating income = $120M − $78M = $42M. Tab 2: 480 employees. Per employee = $42M / 480 = $87,500. Wait — re-check: $42,000,000 / 480 = $87,500. That matches (B). Let's verify all options: $42M / 480 = $87,500. Correct answer is (B) $87,500. Trap: (A) uses FY2024 income ($96M − $70M = $26M; $26M/480 = $54,167 — not listed). (C) uses revenue only. (D) divides by 240 (half the employees). Always verify denominator.

Corrected Answer: (B) $87,500 — Operating income $42M / 480 employees.

2

Based on Tab 3 only, what was the total revenue implied by the Sales division's deal data?

(A) $75M   (B) $90M   (C) $120M   (D) $80M   (E) $160M

Show Answer

Correct Answer: (B) $90M

Tab 3: 1,200 deals × $75,000 per deal = $90,000,000 = $90M. This is the implied Sales-division revenue from deal data. Note this is less than total company revenue ($120M per Tab 1), which is consistent since Engineering and other sources also contribute. Trap: (C) uses total company revenue — that would be using Tab 1, not Tab 3 only as the question requires.

3

Based on all three tabs, which of the following can be inferred about NovaTech's total salary expense in FY2025?

(A) It equals $40.8M   (B) It accounts for more than 50% of operating costs   (C) It is less than operating income   (D) It exceeds total revenue   (E) It cannot be determined from the tabs

Show Answer

Correct Answer: (B) It accounts for more than 50% of operating costs

Tab 2: 480 employees × $85,000 avg salary = $40.8M total salary. Tab 1: Operating costs = $78M. Salary as % of operating costs = $40.8M / $78M = 52.3%. This exceeds 50%, so (B) is confirmed. (A) is also technically true ($40.8M), but GMAT typically picks the answer requiring the most synthesis across tabs — (B) uses Tab 1 and Tab 2. (C): Operating income = $42M > $40.8M salary — actually (C) is also true. (B) is the better answer as it requires inter-tab synthesis explicitly.

4

Tabs 1 and 3 together suggest a possible discrepancy. Which of the following best identifies it?

(A) Total revenue per Tab 1 ($120M) exceeds the implied Sales revenue per Tab 3 ($90M), suggesting other divisions also generate revenue.  (B) Operating costs rose while employee count stayed the same.  (C) Engineering headcount declined.  (D) Tab 3 overstates deal count.  (E) There is no discrepancy between Tabs 1 and 3.

Show Answer

Correct Answer: (A)

Tab 1 states total company revenue = $120M. Tab 3 implies Sales-division revenue of $90M (1,200 deals × $75K). The gap of $30M is not a contradiction but suggests other revenue sources — Engineering products, Admin services, etc. (A) correctly identifies this as a complement (not a real contradiction). Trap: (D) attacks the accuracy of the data without evidence — never accuse data of error on GMAT unless explicitly stated. (E) is wrong because the gap does require explanation, even if it is not a contradiction.

MSR Set 2 — Source Tabs

Tab 1: CEO Email — Regional Expansion

NovaTech opened 3 new regional offices in FY2025: Austin, Denver, and Miami. Each office was staffed with 25 employees. The CEO projects each office will reach profitability within 18 months.

Tab 2: Finance Table — Office Performance

Austin Q4 revenue: $1.2M, costs: $0.9M. Denver Q4 revenue: $0.8M, costs: $1.1M. Miami Q4 revenue: $1.5M, costs: $1.0M. All offices opened at the start of Q3 FY2025.

5

Based on Tab 2, which regional office was unprofitable in Q4 FY2025?

(A) Austin   (B) Miami   (C) Denver   (D) Austin and Miami   (E) All three offices

Show Answer

Correct Answer: (C) Denver

Austin: $1.2M revenue − $0.9M costs = +$0.3M (profitable). Denver: $0.8M − $1.1M = −$0.3M (unprofitable). Miami: $1.5M − $1.0M = +$0.5M (profitable). Only Denver is in the red in Q4. This is a direct read of Tab 2 — no synthesis required. Trap: (E) is tempting if you overlook that offices can individually differ.

6

Based on Tabs 1 and 2, which of the following must be true about Denver's trajectory toward the CEO's profitability projection?

(A) Denver will definitely not meet the 18-month target.  (B) Denver was unprofitable in Q4 but the 18-month target remains possible if performance improves.  (C) Denver should be closed immediately.  (D) The CEO's projection applies only to Austin and Miami.  (E) Denver's Q4 costs will automatically decrease over time.

Show Answer

Correct Answer: (B)

Tab 1: CEO projects profitability within 18 months for each office. All offices opened at start of Q3 (Tab 2 note). Q4 is just 2 quarters in — well within the 18-month window. Denver losing money in Q4 is not evidence that it will miss the target; it may improve in future quarters. (A) overstates certainty — the data does not prove failure. (C) is a recommendation not supported by any tab. (D) misreads Tab 1, which says "each office." (E) is a unsupported automatic assumption — costs do not automatically decline.

7

Based on Tab 1 only, what was the total new headcount added by the regional expansion in FY2025?

(A) 25   (B) 50   (C) 75   (D) 100   (E) Cannot be determined

Show Answer

Correct Answer: (C) 75

Tab 1: 3 offices × 25 employees each = 75 employees total. This is a direct calculation from Tab 1 data. The question specifies "Tab 1 only" — do not use Tab 2. Trap: (E) is wrong because Tab 1 gives exact numbers. (D) would be the result if you mistakenly added a non-existent 4th office or double-counted.

8

Based on Tab 2, what was the combined net result (revenue minus costs) across all three new offices in Q4?

(A) +$0.3M   (B) +$0.5M   (C) +$0.8M   (D) −$0.3M   (E) $0 (break-even)

Show Answer

Correct Answer: (B) +$0.5M

Austin: +$0.3M. Denver: −$0.3M. Miami: +$0.5M. Combined = $0.3 − $0.3 + $0.5 = +$0.5M. The three offices together are net profitable in Q4, even though Denver individually is not. Trap: (A) only adds Austin and ignores Miami. (D) only looks at Denver's loss in isolation.

MSR Set 3 — Source Tabs

Tab 1: HR Email

NovaTech's voluntary attrition rate in FY2025 was 12%. The company started FY2025 with 540 employees. All departures occurred evenly throughout the year.

Tab 2: Hiring Table

New hires in FY2025: Q1: 15, Q2: 22, Q3: 38, Q4: 25. Total new hires: 100. Average time-to-productivity for new hires: 90 days.

Tab 3: CEO Report

CEO states NovaTech ended FY2025 with 480 full-time employees and is targeting a 10% reduction in attrition for FY2026. The 75 new regional employees (3 offices) are included in the end-of-year count.

9

Based on Tab 1 only, how many employees left NovaTech voluntarily in FY2025?

(A) 54   (B) 60   (C) 65   (D) 48   (E) 72

Show Answer

Correct Answer: (C) 65 — Actually (A) 54

Tab 1: 12% attrition rate × 540 starting employees = 0.12 × 540 = 64.8, rounded to 65. However, if the question expects exact calculation: 540 × 0.12 = 64.8 ≈ 65. Closest answer is (C) 65. Trap: (A) 54 would result from applying 10% (not 12%) to 540. Always use the exact percentage given in the tab.

Correct Answer: (C) 65 (rounding 64.8)

10

Based on Tabs 1, 2, and 3, does NovaTech's end-of-year headcount reconcile with what can be calculated from Tabs 1 and 2?

(A) Yes — 540 − 65 + 100 = 575, which matches Tab 3's stated 480.  (B) No — 540 − 65 + 100 = 575, which does not match Tab 3's stated 480 of 480.  (C) Yes — 540 + 100 = 640 employees per Tab 3.  (D) The tabs provide insufficient data to reconcile headcount.  (E) Tab 3's figure of 480 can be reconciled only by assuming additional layoffs.

Show Answer

Correct Answer: (B)

Start: 540 employees. Attrition (Tab 1): 540 × 12% ≈ 65 departures. New hires (Tab 2): 100. Expected end count = 540 − 65 + 100 = 575. But Tab 3 states 480. The gap is 575 − 480 = 95 employees unaccounted for. This IS a genuine discrepancy across the tabs — the three tabs do not fully reconcile. (E) is close but says "only by assuming layoffs" — which is one possible explanation but not the only one (e.g., contract workers, reclassification). (B) is the factual observation that the reconciliation fails.

11

Based on Tab 3, if NovaTech achieves its FY2026 attrition reduction target, what would the new attrition rate be? (Use end-of-FY2025 headcount as the base.)

(A) 2%   (B) 10.8%   (C) 10%   (D) 1.2%   (E) 8.8%

Show Answer

Correct Answer: (B) 10.8%

Tab 3 says: target a 10% reduction in attrition. Current attrition rate (Tab 1) = 12%. A 10% reduction of 12% = 12% × 10% = 1.2 percentage points reduction. New target rate = 12% − 1.2% = 10.8%. Key trap: "10% reduction in attrition" means reduce the rate BY 10% (relative), not reduce it TO 10%. (C) 10% would be the answer if "reduction to 10%" — but the phrasing "10% reduction" means relative reduction. This is a classic GMAT language trap.

12

Which of the following, if true, would best reconcile the headcount discrepancy identified across Tabs 1, 2, and 3?

(A) NovaTech also laid off 95 employees in FY2025, which are not included in the voluntary attrition figure.  (B) The 100 new hires in Tab 2 replaced departing employees and are included in the attrition count.  (C) Tab 3's 480 figure includes only salaried employees, while Tabs 1 and 2 include all workers.  (D) All new hires were in the regional offices and are counted separately.  (E) The CEO's report uses a different fiscal year than Tabs 1 and 2.

Show Answer

Correct Answer: (A)

The discrepancy: expected 575, actual 480, gap = 95. (A) says 95 additional departures from layoffs not counted in the voluntary attrition rate. 540 − 65 (voluntary) − 95 (layoffs) + 100 (new hires) = 480. This perfectly reconciles the three tabs. (B) is logically confused — replacements are still counted as hires AND attrition separately. (C) is a scope explanation but does not produce the exact 95-person gap mathematically. (D) misreads Tab 1 (CEO already confirmed regional employees are included). (E) would make all tab data incomparable and would not specifically explain a 95-person gap.

Quick Reference Card

# MSR Master Reference — Hour 17

## Question Type Decision Tree

Inference/Must-Be-True → Need CERTAINTY; eliminate "could be"

Explanation → Find what RESOLVES the contradiction

Could-Be-True → Just needs to be CONSISTENT with all tabs

## Pre-Question Checklist

[ ] Read ALL tabs before any question

[ ] Note topic, time period, and scope of each tab

[ ] Flag direct contradictions between tabs

[ ] Build one unified fact-set before answering

## Common Calculation Patterns

Revenue per employee = Total revenue / Headcount

Attrition count = Starting headcount × Attrition rate

End headcount = Start − Departed + New hires

Relative reduction = Original rate × Reduction % (NOT subtract %-points)

Net income = Revenue − Operating costs

## Red Flag Phrases (High-Trap Zones)

"10% reduction in X" → Relative, not absolute (X × 10%, not X − 10pp)

"Booked / recognized" → May exclude pending deals

"All categories / each" → Universal claim; one exception breaks it

"Voluntary attrition" → Excludes layoffs and involuntary departures

## Wrong Answer Patterns

-- Uses data from wrong tab(s)

-- True but not supported by the tabs (outside knowledge)

-- Could be true, not must be true

-- Accuses data of error without explicit tab support

-- Applies a general explanation when a specific one exists