Practice Questions
Concept Explanation
Missing-data DI gives partial tables or charts with blanks. Use totals, averages, ratios, or percentages to find the unknown.
Key Formulas
- Row/column total: missing = total − known sum.
- Average given: total = average × count; find missing entry.
- Percentage given: part = (percent/100) × whole.
Example
Row total 500; entries 120, 180, ?. Missing = 500 − 300 = 200.
Common Trap
Check whether the blank is a single cell or an entire row/column total.
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Q1 EasyBudget Rs. 1000 lakh: Rent 300, Salary ?, Travel 200. Salary is:Explanation1000 − 500 = 500. Hence the answer is 500.
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Q2 EasyQuarterly total 420; Q1 = 90, Q2 = 100, Q3 = 110. Q4 is:Explanation420 − 300 = 120. Hence the answer is 120.
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Q3 EasyMissing bar value: total of 4 bars = 360; three bars 70, 90, 110. Fourth is:Explanation360 − 270 = 90. Hence the answer is 90.
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Q4 EasyThree numbers average 40. Two are 35 and 45. Third is:ExplanationTotal = 120. Third = 120 − 80 = 40. Hence the answer is 40.
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Q5 EasyColumn totals: Jan = 150, Feb = ?, Mar = 170; grand total 480. Feb is:Explanation480 − 320 = 160. Hence the answer is 160.
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Q6 EasyPie total 600; sectors 120, 180, ?. Missing sector is:Explanation600 − 300 = 300. Hence the answer is 300.
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Q7 EasyRow total 500; entries 120, 180, ?. Missing value is:Explanation500 − 300 = 200. Hence the answer is 200.
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Q8 EasyTable: A = 90, B = ?, C = 110; total 320. B is:Explanation320 − 200 = 120. Hence the answer is 120.
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Q9 MediumSales Mon–Thu: 50, 60, ?, 80; average 65. Wednesday is:ExplanationTotal = 65 × 4 = 260. Wed = 260 − 190 = 70. Hence the answer is 70.
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Q10 MediumRatio row 2 : 3 : 5; first = 80, third = 200. Middle missing if proportional is:ExplanationOne part = 40. Middle = 3 × 40 = 120. Hence the answer is 120.
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Q11 MediumAverage of 5 numbers is 36. Known sum of four is 160. Fifth number is:ExplanationTotal = 180. Fifth = 180 − 160 = 20. Hence the answer is 20.
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Q12 Medium40% of total 750 is one category; another is 250; rest is ?. Rest is:ExplanationFirst = 300. Rest = 750 − 550 = 200. Hence the answer is 200.
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Q13 HardTwo missing angles in a pie: known angles 80°, 100°, 120° and two equal unknowns. Each unknown is:ExplanationRemaining = 360 − 300 = 60°. Each = 30°. Hence the answer is 30°.
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Q14 HardFive products total 550; four are 80, 90, 110, 120. Fifth is:Explanation550 − 400 = 150. Hence the answer is 150.
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DS1 Easy
What is the missing value if row total is 500?
Statement IKnown entries are 120 and 180.
Statement IIRow total = 500.
ExplanationNeed both known entries and total: missing = 200. Answer: C. -
DS2 Easy
What is the third number if average of three is 40?
Statement ITwo numbers are 35 and 45.
Statement IISum of three numbers is 120.
ExplanationStatement I alone: third = 40. Answer: A.
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DS3 Medium
What is Q4 if quarterly total is 420?
Statement IQ1 = 90, Q2 = 100, Q3 = 110.
Statement IIQ4 is the largest quarter.
ExplanationStatement I alone: Q4 = 120. Answer: A. -
DS4 Medium
What is Wednesday sales if Mon–Thu average is 65?
Statement IMon = 50, Tue = 60, Thu = 80.
Statement IIThere are four days in the set.
ExplanationNeed average and other three days: Wed = 70. Answer: C.