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

A. 133 years

B. 127 years

C. 138 years

D. 266 years

Answer: Option A

Solution (By JKSSB Mock Tests)

Let ages 7k and 5k. Then (7k + 10)/(5k + 10) = 8/8. Solving gives k ≈ 19, age of A = 7*19 = 133.

This question belongs to: Maths Ratio and Proportion

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Practice More Ratio and Proportion Questions

Question #1

If a:b = 6:9 and b:c = 9:10, then a:b:c = ?

A. 6:10:10

B. 5:9:11

C. 12:18:20

D. 6:9:10

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Correct Answer: Option D

Explanation:
Combine ratios: a:b = 6:9, b:c = 9:10 ⇒ a:b:c = 6:9:10.

This question belongs to: Maths Ratio and Proportion

Question #2

If a:b = 2:6 and b:c = 6:11, then a:b:c = ?

A. 2:6:11

B. 1:6:12

C. 2:7:11

D. 4:12:22

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Correct Answer: Option A

Explanation:
Combine ratios: a:b = 2:6, b:c = 6:11 ⇒ a:b:c = 2:6:11.

This question belongs to: Maths Ratio and Proportion

Question #3

Find the mean proportional between 7 and 9.

A. 14

B. 7

C. 16

D. 10

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Correct Answer: Option B

Explanation:
Mean proportional = √(7 × 9) = √(63) = 7.

This question belongs to: Maths Ratio and Proportion

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