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Aptitude & Reasoning interview questions

Quantitative, logical reasoning, verbal — essential for TCS, Infosys, Wipro.

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Showing 12 of 32 source questions. Sample answers are study material, not employer-specific hiring guidance.

How to work through this preview

Attempt each question before reading its answer. For a concept, give a definition and a concrete example. For code, state constraints, walk through a small input, and check complexity. For design, separate requirements from assumptions and explain failure handling. Use real situations for behavioral answers.

QUESTION 1 / easy / aptitude

A train 150m long passes a pole in 15 seconds. How long will it take to pass a platform 300m long?

Supplied choices

  1. 30 seconds
  2. 40 seconds
  3. 45 seconds
  4. 60 seconds

Source answer choice: C. 45 seconds

Sample answer

Speed of train = 150m / 15s = 10 m/s Distance to cross platform = 150 + 300 = 450m Time = 450 / 10 = 45 seconds

Hints to guide your next attempt

  • Speed = distance/time
  • Total distance to cross the platform = train length + platform length

Source tags: aptitude / speed-distance / trains

QUESTION 2 / easy / aptitude

If all Bloops are Razzles, and all Razzles are Lazzles, are all Bloops definitely Lazzles?

Supplied choices

  1. Yes, definitely — all Bloops are Lazzles
  2. No — Bloops and Lazzles are unrelated
  3. Cannot be determined from the given information
  4. Only some Bloops are Lazzles

Source answer choice: A. Yes, definitely — all Bloops are Lazzles

Sample answer

Yes. This is a syllogism — transitive logic. Bloops is a subset of Razzles (all Bloops are Razzles) Razzles is a subset of Lazzles (all Razzles are Lazzles) Therefore: Bloops is a subset of Lazzles — all Bloops are Lazzles. Venn diagram: Lazzles is the biggest circle, Razzles sits inside it, Bloops sits inside Razzles.

Hints to guide your next attempt

  • Draw a Venn diagram
  • Transitive property of sets

Source tags: aptitude / logical-reasoning / syllogism

QUESTION 3 / easy / aptitude

A sum of Rs. 1200 is lent at 10% per annum simple interest. What is the interest after 3 years?

Supplied choices

  1. Rs. 300
  2. Rs. 360
  3. Rs. 400
  4. Rs. 420

Source answer choice: B. Rs. 360

Sample answer

SI = (Principal x Rate x Time) / 100 SI = (1200 x 10 x 3) / 100 = 36000 / 100 = Rs. 360 Total amount = 1200 + 360 = Rs. 1560

Hints to guide your next attempt

  • SI = (P x R x T) / 100

Source tags: aptitude / simple-interest / mathematics

QUESTION 4 / easy / aptitude

What is the next number in the series: 2, 6, 12, 20, 30, ?

Supplied choices

  1. 38
  2. 40
  3. 42
  4. 44

Source answer choice: C. 42

Sample answer

Differences: 6-2=4, 12-6=6, 20-12=8, 30-20=10. The differences increase by 2. Next difference = 12. So next term = 30 + 12 = 42. Pattern: n x (n+1) where n = 1,2,3... 1x2=2, 2x3=6, 3x4=12, 4x5=20, 5x6=30, 6x7=42

Hints to guide your next attempt

  • Look at differences between consecutive terms: 4, 6, 8, 10...
  • Each term = n x (n+1)

Source tags: aptitude / number-series / pattern

QUESTION 5 / easy / aptitude

A shopkeeper buys an article for Rs. 400 and sells it for Rs. 500. What is the profit percentage?

Supplied choices

  1. 20%
  2. 25%
  3. 30%
  4. 40%

Source answer choice: B. 25%

Sample answer

Cost Price (CP) = Rs. 400 Selling Price (SP) = Rs. 500 Profit = SP - CP = 500 - 400 = Rs. 100 Profit% = (Profit / CP) x 100 = (100 / 400) x 100 = 25%

Hints to guide your next attempt

  • Profit% = (Profit / Cost Price) x 100
  • Profit = Selling Price - Cost Price

Source tags: aptitude / profit-loss / percentage

QUESTION 6 / easy / aptitude

If A can do a piece of work in 10 days and B can do the same work in 15 days, how many days will they take to complete it working together?

Supplied choices

  1. 5 days
  2. 6 days
  3. 8 days
  4. 12 days

Source answer choice: B. 6 days

Sample answer

A's rate = 1/10 work per day B's rate = 1/15 work per day Combined rate = 1/10 + 1/15 = 3/30 + 2/30 = 5/30 = 1/6 work per day Time together = 1 / (1/6) = 6 days

Hints to guide your next attempt

  • Work rate = 1/days
  • Combined rate = rate_A + rate_B

Source tags: aptitude / time-work / mathematics

QUESTION 7 / medium / aptitude

The ages of Ravi and Suresh are in the ratio 4:5. After 5 years, their ages will be in the ratio 5:6. What is Ravi's current age?

Supplied choices

  1. 16 years
  2. 20 years
  3. 24 years
  4. 25 years

Source answer choice: B. 20 years

Sample answer

Let Ravi's age = 4x, Suresh's age = 5x. After 5 years: (4x + 5) / (5x + 5) = 5/6 Cross multiply: 6(4x + 5) = 5(5x + 5) 24x + 30 = 25x + 25 x = 5 Ravi's current age = 4x = 4 x 5 = 20 years

Hints to guide your next attempt

  • Let ages be 4x and 5x
  • Form an equation using the future ratio

Source tags: aptitude / age-problems / ratio

QUESTION 8 / medium / aptitude

Find the compound interest on Rs. 10,000 at 10% per annum for 2 years, compounded annually.

Supplied choices

  1. Rs. 2000
  2. Rs. 2100
  3. Rs. 2200
  4. Rs. 2500

Source answer choice: B. Rs. 2100

Sample answer

Method 1 (Formula): CI = P(1 + R/100)^T - P CI = 10000 x (1 + 10/100)^2 - 10000 CI = 10000 x (1.1)^2 - 10000 CI = 10000 x 1.21 - 10000 CI = 12100 - 10000 = Rs. 2100 Method 2 (Year by year): Year 1 interest = 10% of 10000 = Rs. 1000. Amount = 11000. Year 2 interest = 10% of 11000 = Rs. 1100. Amount = 12100. Total CI = 1000 + 1100 = Rs. 2100 Note: Simple Interest for 2 years would be Rs. 2000. CI > SI because of interest on interest.

Hints to guide your next attempt

  • CI = P x (1 + R/100)^T - P
  • Or calculate year by year: interest on interest

Source tags: aptitude / compound-interest / mathematics

QUESTION 9 / easy / aptitude

Two pipes A and B can fill a tank in 20 minutes and 30 minutes respectively. If both pipes are opened together, in how many minutes will the tank be filled?

Supplied choices

  1. 10 min
  2. 12 min
  3. 15 min
  4. 25 min

Source answer choice: B. 12 min

Sample answer

Pipe A fills 1/20 of tank per minute. Pipe B fills 1/30 of tank per minute. Combined rate = 1/20 + 1/30 = 3/60 + 2/60 = 5/60 = 1/12 per minute. Time to fill = 12 minutes.

Hints to guide your next attempt

  • Rate of A = 1/20 per min, Rate of B = 1/30 per min

Source tags: aptitude / pipes-cisterns / time-work

QUESTION 10 / easy / aptitude

A and B invest Rs. 5000 and Rs. 3000 in a business. At the end of the year, the total profit is Rs. 4800. What is A's share?

Supplied choices

  1. Rs. 2400
  2. Rs. 2800
  3. Rs. 3000
  4. Rs. 3200

Source answer choice: C. Rs. 3000

Sample answer

Ratio of investments = 5000 : 3000 = 5 : 3 Total parts = 5 + 3 = 8 A's share = (5/8) x 4800 = Rs. 3000 B's share = (3/8) x 4800 = Rs. 1800 Verification: 3000 + 1800 = 4800. Correct.

Hints to guide your next attempt

  • Profit is divided in ratio of investments
  • Ratio = 5000:3000 = 5:3

Source tags: aptitude / partnership / ratio

QUESTION 11 / easy / aptitude

A student scores 75% in an exam. If the maximum marks are 800, how many marks did the student score?

Supplied choices

  1. 550
  2. 575
  3. 600
  4. 625

Source answer choice: C. 600

Sample answer

Marks scored = (75/100) x 800 = 0.75 x 800 = 600 marks

Hints to guide your next attempt

  • Marks = (percentage/100) x total marks

Source tags: aptitude / percentage / mathematics

QUESTION 12 / medium / aptitude

The price of a commodity increases by 25%. By what percentage must consumption be reduced to keep the expenditure the same?

Supplied choices

  1. 15%
  2. 20%
  3. 25%
  4. 30%

Source answer choice: B. 20%

Sample answer

Let original price = 100, new price = 125 (25% increase). To keep expenditure same, new consumption = (100/125) x original consumption. Reduction = original - new = original - (100/125) x original = (25/125) x original Reduction% = (25/125) x 100 = 20% Consumption must be reduced by 20%. Quick formula: if price increases by x%, reduce consumption by x/(100+x) x 100% = 25/125 x 100 = 20%

Hints to guide your next attempt

  • If price becomes 125, to keep expenditure same: new consumption = 100/125 x original
  • Reduction% = (25/125) x 100

Source tags: aptitude / percentage / expenditure

Check understanding, not recognition

  • Can you explain the answer without reading it?
  • Can you show when the approach fails or needs a different assumption?
  • Can you connect the concept to a real project, task, or decision you have made?
  • Can you distinguish a simplified interview example from a production requirement?

A LITTLE MORE CLARITY

Frequently asked questions

How many Aptitude & Reasoning questions are shown here?

This public preview shows 12 questions with the supplied answers from the app's 32-question Aptitude & Reasoning bank. Full interactive practice requires signing in.

Should I memorize the sample answers?

Use them as reference explanations, not a script or a guarantee of technical correctness for every environment. Explain your assumptions, validate code against your language and version, and discuss trade-offs. Behavioral answers should be built from your own experience.

What do hints and solution steps mean?

Hints identify ideas to consider before reading the answer. When the source question includes steps, they are shown as a separate walkthrough. Example capacities and design targets in a solution are assumptions for that exercise, not real system statistics.

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