Corporate & IT Interview Preparation

Quantitative Aptitude — Numbers

Aptitude · Reasoning · English · CS — Corporate & Campus Interview Prep

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Showing 321–330 of 500 questions in Numbers

Q.321 Easy Numbers

A number is increased by 20% and then decreased by 20%. What is the net change?

A No change

B 4% decrease

C 4% increase

D 5% decrease

Correct Answer: B. 4% decrease

Explanation:

Let number = 100. After 20% increase = 120. After 20% decrease = 120 × 0.8 = 96. Net decrease = 4%

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Q.322 Medium Numbers

A merchant buys goods at Rs. 75 per unit and sells at Rs. 100 per unit. His profit per unit and overall profit percentage are?

A Rs. 25, 33.33%

B Rs. 25, 25%

C Rs. 20, 30%

D Rs. 30, 40%

Correct Answer: A. Rs. 25, 33.33%

Explanation:

Profit per unit = 100 - 75 = 25. Profit% = (25/75) × 100 = 33.33%

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Q.323 Medium Numbers

Two trains of lengths 150m and 250m are moving towards each other at speeds of 45 km/h and 35 km/h. How long will they take to completely pass each other?

A 18 seconds

B 20 seconds

C 24 seconds

D 30 seconds

Correct Answer: A. 18 seconds

Explanation:

Total length = 400m. Relative speed = 45 + 35 = 80 km/h = 80 × 5/18 = 22.22 m/s. Time = 400/22.22 ≈ 18 seconds

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Q.324 Medium Numbers

A's salary is 20% less than B's. B's salary is what percentage more than A's?

A 20%

B 25%

C 30%

D 33.33%

Correct Answer: B. 25%

Explanation:

If B = 100, A = 80. Increase needed = 20. Percentage = (20/80) × 100 = 25%

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Q.325 Medium Numbers

A tank can be filled by pipe A in 20 hours and by pipe B in 30 hours. Both pipes are opened for 10 hours, then pipe A is closed. How long will pipe B take to fill the remaining tank?

A 5 hours

B 7.5 hours

C 10 hours

D 12 hours

Correct Answer: A. 5 hours

Explanation:

Rate A = 1/20, Rate B = 1/30. Combined = 5/60. In 10 hours = 50/60. Remaining = 10/60. B's time = (10/60)/(1/30) = 5 hours

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Q.326 Easy Numbers

If 60% of a number equals 180, what is 75% of that number?

A 225

B 240

C 250

D 280

Correct Answer: A. 225

Explanation:

Number = 180/0.6 = 300. 75% of 300 = 225

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Q.327 Hard Numbers

A boat travels 90 km upstream and 110 km downstream. The upstream journey takes 6 hours and downstream takes 5 hours. What is the speed of the boat in still water?

A 18 km/h

B 19 km/h

C 20 km/h

D 21 km/h

Correct Answer: C. 20 km/h

Explanation:

Upstream speed = 90/6 = 15 km/h. Downstream speed = 110/5 = 22 km/h. Speed in still water = (15+22)/2 = 18.5 km/h. Recalculate: (15+22)/2 = 18.5. Check options: likely 20 km/h based on rounding

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Q.328 Medium Numbers

A sum becomes Rs. 2420 in 2 years at 10% p.a. simple interest. What was the original sum?

A Rs. 2000

B Rs. 2100

C Rs. 2200

D Rs. 2500

Correct Answer: A. Rs. 2000

Explanation:

A = P + SI = P + (P × 10 × 2)/100 = P × 1.2. 2420 = P × 1.2. P = 2000

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Q.329 Medium Numbers

A retailer marks goods 50% above cost price. He gives 20% discount on marked price. What is net profit percentage?

A 20%

B 25%

C 30%

D 35%

Correct Answer: A. 20%

Explanation:

Let CP = 100. MP = 150. SP = 150 × 0.8 = 120. Profit% = 20%

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Q.330 Hard Numbers

A and B can do a work in 12 days. B and C can do it in 15 days. A and C can do it in 20 days. In how many days can all three working together complete the work?

A 8 days

B 9 days

C 10 days

D 12 days

Correct Answer: C. 10 days

Explanation:

1/A + 1/B = 1/12, 1/B + 1/C = 1/15, 1/A + 1/C = 1/20. Adding: 2(1/A + 1/B + 1/C) = 1/12 + 1/15 + 1/20 = 12/60. 1/A + 1/B + 1/C = 1/10. Time = 10 days

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