Ratio of present ages of A and B is 7:5. After 7 years, the ratio becomes 10:8. Present age of A is? MCQ with Answer and Explanation

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Ratio of present ages of A and B is 7:5. After 7 years, the ratio becomes 10:8. Present age of A is?

A. 252 years

B. 123 years

C. 126 years

D. 131 years

Answer: Option C

Solution (By JKSSB Mock Tests)

Let ages 7k and 5k. Then (7k + 7)/(5k + 7) = 10/8. Solving gives k ≈ 18, age of A = 7*18 = 126.

This question belongs to: Maths Ratio and Proportion

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Practice More Ratio and Proportion Questions

Question #1

If a:b = 5:8 and b:c = 8:6, then a:b:c = ?

A. 5:9:6

B. 5:8:6

C. 4:8:7

D. 10:16:12

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Correct Answer: Option B

Explanation:
Combine ratios: a:b = 5:8, b:c = 8:6 ⇒ a:b:c = 5:8:6.

This question belongs to: Maths Ratio and Proportion

Question #2

If a:b = 3:6 and b:c = 6:4, then a:b:c = ?

A. 3:6:4

B. 6:12:8

C. 3:7:4

D. 2:6:5

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Correct Answer: Option A

Explanation:
Combine ratios: a:b = 3:6, b:c = 6:4 ⇒ a:b:c = 3:6:4.

This question belongs to: Maths Ratio and Proportion

Question #3

Ratio of present ages of A and B is 3:6. After 8 years, the ratio becomes 5:8. Present age of A is?

A. 66 years

B. 74 years

C. 69 years

D. 138 years

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Correct Answer: Option C

Explanation:
Let ages 3k and 6k. Then (3k + 8)/(6k + 8) = 5/8. Solving gives k ≈ 23, age of A = 3*23 = 69.

This question belongs to: Maths Ratio and Proportion

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