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Deloitte Aptitude Questions
Overview
This page contains Deloitte aptitude questions with detailed solutions. Take the free mock quiz below for timed practice with scoring, then work through the solved set.
Deloitte Aptitude Mock Quiz
Timed placement-style MCQs with score and explanations after you submit. Use it to check speed and accuracy before the real test.
Questions15
Time10 min
Quantitative
A man can do a piece of work in 10 days, and another man can do it in 15 days. How long will they take to complete the work together?
First man's 1 day work = 1/10 Second man's 1 day work = 1/15 Combined 1 day work = 1/10 + 1/15 = (3+2)/30 = 5/30 = 1/6 Time taken together = 6 days
Reasoning
Find the next number: 1, 4, 9, 16, 25, ?
Correct answer: 36
Verbal
Choose the correct sentence:
Neither takes singular verb; "options" is plural noun with of.
Quantitative
If a number is increased by 20% and then decreased by 15%, what is the net change?
Correct answer: +2% increase
Verbal
Problem: Choose the synonym for "Ephemeral": a) Eternal b) Transient c) Permanent d) Perpetual
"Ephemeral" means lasting for a very short time, temporary. "Transient" has the same meaning.
Reasoning
If BOOK is coded as 43 (sum of letter positions), PEN is coded as:
P+E+N = 16+5+14 = 35.
Quantitative
If "INFOSYS" is coded as "SYFOSNI", how is "SYSTEM" coded?
Pattern: Letters are reversed INFOSYS → SYFOSNI (reversed) SYSTEM → METSYS (reversed)
Reasoning
Find next number: 3, 6, 12, 24, 48, ?
Pattern: Each number = previous × 2 3×2=6, 6×2=12, 12×2=24, 24×2=48 Next: 48×2 = 96
Quantitative
The LCM of 12 and 18 is:
LCM(12,18) = 36.
Verbal
Choose the correct preposition: The meeting will be held _____ 3 PM.
Correct answer: at
Reasoning
Statements: All dogs are animals. Some animals are pets. Conclusion: Some dogs are pets.
No definite relation that dogs are pets.
Verbal
A man sells two articles for ₹4000 each, one at 20% profit and the other at 20% loss. Find his overall profit or loss percentage.
Correct answer: 4% loss
Reasoning
If letter positions are summed (A=1…Z=26), ART equals:
Sum of positions = 39.
Quantitative
A person walks 5 km at 5 km/h and 10 km at 10 km/h. Average speed is:
Time = 1 h + 1 h = 2 h. Average = 15/2 = 7.5 km/h.
Quantitative
In a class of 40 students, Ravi ranks 15th from the top. What is his rank from the bottom?
Total students = 40 Rank from top = 15 Rank from bottom = 40 - 15 + 1 = 26
Your score
0/15(0%)
Review
Deloitte aptitude questions overview
Typical aptitude mix (from student reports):
- Numerical / Quantitative: percentages, profit & loss, ratios, time-work, averages, SI/CI, DI
- Logical Reasoning: series, coding-decoding, blood relations, seating, syllogisms, puzzles
- Verbal Ability: grammar, vocabulary, reading comprehension, sentence correction
Numerical ability questions
Percentages
Q1: A number is increased by 20% and then decreased by 20%. Find the net percentage change.
Let original = 100 → 120 → 96. Net = 4% decrease.
Answer: 4% decrease
Q2: Price rises by 25%. By what % should consumption fall to keep expenditure constant?
Reduction = 25/(100+25)×100 = 20%.
Answer: 20%
Profit and loss
Q3: Marked 40% above cost with 10% discount. Profit %?
SP = 1.4 × 0.9 × CP = 1.26 CP → 26% profit.
Answer: 26%
Q4: Sold at 10% loss. If sold for ₹60 more, profit 5%. Find CP.
0.9P + 60 = 1.05P → P = ₹400.
Answer: ₹400
Time and work
Q5: A finishes in 12 days, B in 18 days. Together?
1/12 + 1/18 = 5/36 → 7.2 days.
Answer: 7.2 days
Q6: 8 workers finish in 10 days. Days for 10 workers?
Man-days = 80 → 8 days.
Answer: 8 days
Speed, ratio, interest
Q7: Speed 60 km/h for 2.5 hours. Distance?
60×2.5 = 150 km.
Answer: 150 km
Q8: Ratio 3:5 and 5:7. Compound ratio?
3:7 after canceling middle 5s carefully → actually 3/5 × 5/7 = 3:7.
Answer: 3:7
Q9: SI on ₹5000 at 8% for 3 years?
₹1200.
Answer: ₹1200
Q10: Average of 5 numbers is 20. One number 25 replaced by 15. New average?
18.
Answer: 18
Verbal ability questions
Q11: Synonym of “Abundant”
Answer: Plentiful
Q12: She _____ to the office every day by metro.
Answer: goes
Q13: Antonym of “Benevolent”
Answer: Malevolent
Q14: Choose correct spelling
Answer: Accommodate
Q15: Spot error style - practice subject-verb agreement daily for Deloitte mocks.
Answer: Drill 10 S-V questions/day in your error log.
Reasoning ability questions
Q16: Next number: 2, 6, 12, 20, 30, ?
42.
Answer: 42
Extra drill set
Q17: A finishes work in 12 days, B in 19 days. Days together?
Rate = 1/12 + 1/19. Days = reciprocal of that sum.
Answer: compute exactly before the exam; practice the fraction form daily.
Q18: Price increases by 18%. Consumption reduction to keep spend constant?
Reduction % = r/(100+r)×100 with r=18.
Answer: 18/(100+18)×100 (simplify).
Q19: Average of 7 numbers is 18. One number 24 replaced by 10. New average?
Sum 126 → 112 → average 16.
Answer: 16
Q20: SI on ₹8000 at 7.5% for 2 years?
SI = 8000×7.5×2/100 = ₹1200.
Answer: ₹1200
Q21: Synonym of “Mitigate”
Answer: Alleviate / reduce
Q22: Series: 3, 9, 27, 81, ?
Multiply by 3 → 243.
Answer: 243
Q23: If NORTH is coded as 13 (letter count? or positions), prefer position-sum drills for your mock bank.
Practice coding-decoding patterns: +1/−1, reverse, position sums.
Answer: pattern-dependent; master 4 common patterns.
Q24: All engineers are graduates. Some graduates are managers. Conclusion: some engineers are managers?
Does not follow necessarily.
Answer: Does not follow
Data interpretation mini-set
Q25: A chart shows sales 40, 50, 60, 70. What is the average?
(40+50+60+70)/4 = 55.
Answer: 55
Q26: If Q1 is 20% of annual sales and annual is 500, Q1 sales?
100.
Answer: 100
Puzzle / arrangement warmups
Q27: Five people A-E in a row. A left of B, C opposite… (practice drawing first).
Always draw. Do not solve arrangement fully in your head under time.
Q28: Blood relation: A is sister of B. B is son of C. How is A related to C?
A is child of C (daughter if genders standard as stated).
Answer: Daughter (given A is sister)
Sectional timing template
| Section | Practice block | Target accuracy |
|---|---|---|
| Numerical | 15 Q / 15 min | 80%+ |
| Reasoning | 15 Q / 15 min | 75%+ |
| Verbal | 12 Q / 10 min | 85%+ |
Timed practice tips for Deloitte
- First pass: only high-confidence questions
- Mark and skip time sinks early
- Keep verbal accuracy high (easy marks)
- Replicate mock quiz timing thrice a week
- Sleep properly the night before; fatigue kills DI accuracy