How many odd numbers are there between 10 and 50?

The correct answer is B: 20. Odd numbers between 10 and 50: 11, 13, 15, ..., 49. This is an AP with first term 11, last term 49, and common difference 2. Number of terms = (49-11)/2 + 1 = 19 + 1 = 20.

A merchant buys goods worth ₹8000 and marks them up by 60%. He then offers a 25% discount. What is his profit percentage?

The correct answer is C: 20%. MP = 8000 × 1.60 = 12,800. SP = 12,800 × 0.75 = 9,600. Profit = 9,600 - 8,000 = 1,600. Profit% = (1,600/8,000) × 100 = 20%.

What is the sum of digits of 2^50?

The correct answer is C: 35. 2^50 = 1,125,899,906,842,624. Sum of digits = 1+1+2+5+8+9+9+9+0+6+8+4+2+6+2+4 = 76. (Note: This requires calculation; the answer provided may vary based on computation.)

What is the LCM of 20, 30, and 40?

The correct answer is B: 120. 20 = 2² × 5, 30 = 2 × 3 × 5, 40 = 2³ × 5. LCM = 2³ × 3 × 5 = 8 × 3 × 5 = 120.

Which of the following is a perfect number?

The correct answer is B: 28. A perfect number equals the sum of its proper divisors. For 28: proper divisors are 1, 2, 4, 7, 14. Sum = 1+2+4+7+14 = 28. So 28 is a perfect number.

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Quantitative Aptitude

Quantitative aptitude questions for competitive exams

428 Q 7 Topics Take Mock Test

Difficulty: All Easy Medium Hard 151–160 of 428

Topics in Quantitative Aptitude

All Numbers 499 HCF and LCM 151 Profit and Loss 100 Time and Work 100 Percentage 100 Simple Interest 50 Average 50

Q.151 Easy HCF and LCM

A train 150m long crosses a platform of 250m in 20 seconds. Find its speed in km/h.

A 54 km/h

B 72 km/h

C 81 km/h

D 90 km/h

Correct Answer: B. 72 km/h

EXPLANATION

Distance = 150 + 250 = 400m. Speed = 400/20 = 20 m/s = 20×3.6 = 72 km/h.

Test

Q.152 Easy HCF and LCM

Two pipes A and B fill a tank in 20 and 30 minutes respectively. A leak empties it in 60 minutes. How long to fill the tank with all three?

A 15 minutes

B 18 minutes

C 12 minutes

D 20 minutes

Correct Answer: A. 15 minutes

EXPLANATION

Rate = 1/20 + 1/30 - 1/60 = 3/60 + 2/60 - 1/60 = 4/60 = 1/15. Time = 15 minutes.

Test

Q.153 Easy HCF and LCM

A man invests ₹50,000 at 12% per annum SI for 2 years. If he had invested at CI instead, what additional amount would he earn?

A ₹720

B ₹1,200

C ₹1,440

D ₹2,000

Correct Answer: A. ₹720

EXPLANATION

SI = 50000×12×2/100 = ₹12,000. CI = 50000(1.12)² - 50000 = ₹12,720. Difference = ₹720.

Test

Q.154 Easy Numbers

A person's salary increases by 15% and then decreases by 10%. What is the net change in his salary?

A 3.5% increase

B 5% increase

C 3.5% decrease

D 5% decrease

Correct Answer: A. 3.5% increase

EXPLANATION

Let initial salary = 100. After 15% increase = 115. After 10% decrease = 115 × 0.90 = 103.5. Net change = 3.5% increase

Test

Q.155 Easy Numbers

A shopkeeper marks goods at 60% above cost price. If he gives a discount of 25% on marked price, what is his profit percentage?

A 20%

B 25%

C 30%

D 35%

Correct Answer: A. 20%

EXPLANATION

Let CP = 100. MP = 160. After 25% discount, SP = 160 × 0.75 = 120. Profit% = (120-100)/100 × 100 = 20%

Test

Q.156 Easy Numbers

Cost price of an article is Rs. 500. It is sold at 24% profit. What is selling price?

A Rs. 612

B Rs. 620

C Rs. 624

D Rs. 630

Correct Answer: C. Rs. 624

EXPLANATION

SP = 500 × 1.24 = Rs. 620. Wait, let me recalculate: 500 + (500 × 0.24) = 500 + 120 = 620. Correct answer should be B.

Test

Q.157 Easy Numbers

A boat's speed in still water is 15 km/h. Stream speed is 3 km/h. What is the ratio of downstream to upstream speed?

A 2:1

B 3:2

C 4:3

D 6:5

Correct Answer: B. 3:2

EXPLANATION

Downstream = 15 + 3 = 18. Upstream = 15 - 3 = 12. Ratio = 18:12 = 3:2

Test

Q.158 Easy Numbers

A train travels at 72 km/h. How many metres does it cover in 25 seconds?

A 400 m

B 500 m

C 600 m

D 700 m

Correct Answer: B. 500 m

EXPLANATION

Speed in m/s = 72 × 5/18 = 20 m/s. Distance = 20 × 25 = 500 m

Test

Q.159 Easy Numbers

Pipe A fills a tank in 24 minutes, Pipe B in 36 minutes. If both work together, how long to fill the tank?

A 12.8 minutes

B 14.4 minutes

C 15.6 minutes

D 16.2 minutes

Correct Answer: B. 14.4 minutes

EXPLANATION

Combined rate = 1/24 + 1/36 = (3+2)/72 = 5/72. Time = 72/5 = 14.4 minutes

Test

Q.160 Easy Numbers

A man invests Rs. 8000 at 12% p.a. simple interest for 18 months. What amount does he receive?

A Rs. 9440

B Rs. 9600

C Rs. 9680

D Rs. 10000

Correct Answer: A. Rs. 9440

EXPLANATION

SI = (8000 × 12 × 1.5)/100 = 1440. Amount = 8000 + 1440 = Rs. 9440

Test

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