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. 56 years

B. 61 years

C. 52 years

D. 112 years

Answer: Option A

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 = 5:6 and b:c = 6:7, then a:b:c = ?

A. 4:6:8

B. 5:7:7

C. 5:6:7

D. 10:12:14

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Correct Answer: Option C

Explanation:
Combine ratios: a:b = 5:6, b:c = 6:7 ⇒ a:b:c = 5:6:7.

This question belongs to: Maths Ratio and Proportion

Question #2

Two numbers are in the ratio 10:13 and their sum is 454. Find the numbers.

A. 380 and 494

B. 204 and 226

C. 190 and 247

D. 174 and 258

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Correct Answer: Option C

Explanation:
Numbers = 10k and 13k. 10k + 13k = 454 ⇒ k = 19. Thus, numbers are 190 and 247.

This question belongs to: Maths Ratio and Proportion

Question #3

Find the mean proportional between 7 and 35.

A. 30

B. 42

C. 15

D. 18

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Correct Answer: Option C

Explanation:
Mean proportional = √(7 × 35) = √(245) = 15.

This question belongs to: Maths Ratio and Proportion

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