Ratio of present ages of A and B is 4:8. After 6 years, the ratio becomes 5:10. Present age of A is? MCQ with Answer and Explanation

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Ratio of present ages of A and B is 4:8. After 6 years, the ratio becomes 5:10. Present age of A is?

A. 112 years

B. 56 years

C. 61 years

D. 52 years

Answer: Option B

Solution (By JKSSB Mock Tests)

Let ages 4k and 8k. Then (4k + 6)/(8k + 6) = 5/10. Solving gives k ≈ 14, age of A = 4*14 = 56.

This question belongs to: Maths Ratio and Proportion

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Practice More Ratio and Proportion Questions

Question #1

If a:b = 3:3 and b:c = 3:7, then a:b:c = ?

A. 2:3:8

B. 6:6:14

C. 3:4:7

D. 3:3:7

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Correct Answer: Option D

Explanation:
Combine ratios: a:b = 3:3, b:c = 3:7 ⇒ a:b:c = 3:3:7.

This question belongs to: Maths Ratio and Proportion

Question #2

Milk and water are in ratio 7:2 in a 578 L mixture. Quantity of milk?

A. 129 L

B. 449 L

C. 898 L

D. 473 L

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Correct Answer: Option B

Explanation:
Total parts = 9. Milk = [7 / (7+2)] × 578 = 449 L.

This question belongs to: Maths Ratio and Proportion

Question #3

If a:b = 3:10 and b:c = 10:5, then a:b:c = ?

A. 2:10:6

B. 3:10:5

C. 6:20:10

D. 3:11:5

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Correct Answer: Option B

Explanation:
Combine ratios: a:b = 3:10, b:c = 10:5 ⇒ a:b:c = 3:10:5.

This question belongs to: Maths Ratio and Proportion

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