Two pipes can fill a tank in 10 hours and 15 hours respectively. A drain empties it in 20 hours. If all three are opened, how long to fill the tank?

The correct answer is B: 8.57 hours. Net rate = 1/10 + 1/15 - 1/20 = 6/60 + 4/60 - 3/60 = 7/60; Time = 60/7 ≈ 8.57 hours

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?

The correct answer is A: Rs. 25, 33.33%. Profit per unit = 100 - 75 = 25. Profit% = (25/75) × 100 = 33.33%

If A is 25% more than B and B is 20% less than C, what is the relationship between A and C?

The correct answer is B: A is 5% more than C. Let C = 100. B = 80. A = 100. Wait: B = 80, A = 1.25 × 80 = 100. So A = C. Hmm, let me recalculate: If B is 20% less than C, B = 0.8C. A is 25% more than B, so A = 1.25B = 1.25 × 0.8C = C. So A = C. But answer says B is correct. Let me verify: A = 1.25B, B = 0.8C. A = 1.25 × 0.8C = C. A/C = 1. So A

A bank offers a scheme where you can deposit ₹20000 and earn simple interest at 9% per annum. The same amount is also offered by another bank at 8.5% per annum with ₹500 annual bonus. After 6 years, which bank's offer is better and by how much?

The correct answer is D: First bank by ₹600. Step 1: First bank SI = (20000 × 9 × 6) / 100 = ₹10800. Step 2: Second bank SI = (20000 × 8.5 × 6) / 100 = ₹10200, plus bonus = 500 × 6 = ₹3000. Total = 10200 + 3000 = ₹13200. Wait, let me recalculate: Step 2 (corrected): Second bank SI = ₹10200, bonus = ₹3000, total = ₹13200. This makes second bank

A can complete a work in 12 days and B can complete it in 18 days. How many days will they take working together?

The correct answer is A: 7.2 days. A's rate = 1/12, B's rate = 1/18. Combined rate = 1/12 + 1/18 = 3/36 + 2/36 = 5/36. Time = 36/5 = 7.2 days

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Quantitative aptitude questions for competitive exams

41 Q 7 Topics Take Mock Test

Difficulty: All Easy Medium Hard 41–41 of 41

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.41 Medium Percentage Successive Discounts

A mobile phone is marked at ₹15,000. A customer gets successive discounts of 10% and 5%. What is the final price?

A ₹12,675

B ₹12,750

C ₹12,825

D ₹12,900

Correct Answer: A. ₹12,675

EXPLANATION

Step 1: After first discount of 10%: Price = 15,000 × (1 - 0.10) = 15,000 × 0.90 = ₹13,500.

Step 2: After second discount of 5%: Price = 13,500 × (1 - 0.05) = 13,500 × 0.95 = ₹12,825.

Wait, recalculating: Step 2 correction = 13,500 × 0.95 = 12,825.

Rechecking calculation: 15,000 × 0.90 × 0.95 = 15,000 × 0.855 = ₹12,825.

Let me verify option A: 12,675 = 15,000 × 0.845.

Correct calculation: 15,000 × 0.90 = 13,500; 13,500 × 0.95 = 12,825.

The answer should be ₹12,825 which is option C.

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Quantitative Aptitude Percentage

Quantitative Aptitude
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