Ratio of present ages of A and B is 7:8. After 11 years, the ratio becomes 8:9. Present age of A is? MCQ with Answer and Explanation

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Ratio of present ages of A and B is 7:8. After 11 years, the ratio becomes 8:9. Present age of A is?

A. 119 years

B. 252 years

C. 126 years

D. 131 years

Answer: Option C

Solution (By JKSSB Mock Tests)

Let ages 7k and 8k. Then (7k + 11)/(8k + 11) = 8/9. Solving gives k ≈ 18, age of A = 7*18 = 126.

This question belongs to: Maths Ratio and Proportion

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Question #1

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Ratio of present ages of A and B is 5:7. After 9 years, the ratio becomes 6:10. Present age of A is?

A. 45 years

B. 40 years

C. 50 years

D. 90 years

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Correct Answer: Option A

Explanation:
Let ages 5k and 7k. Then (5k + 9)/(7k + 9) = 6/10. Solving gives k ≈ 9, age of A = 5*9 = 45.

This question belongs to: Maths Ratio and Proportion

Question #2

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If a:b = 6:5 and b:c = 5:4, then a:b:c = ?

A. 12:10:8

B. 6:6:4

C. 5:5:5

D. 6:5:4

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Correct Answer: Option D

Explanation:
Combine ratios: a:b = 6:5, b:c = 5:4 ⇒ a:b:c = 6:5:4.

This question belongs to: Maths Ratio and Proportion

Question #3

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If a:b = 7:4 and b:c = 4:10, then a:b:c = ?

A. 7:5:10

B. 6:4:11

C. 14:8:20

D. 7:4:10

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Correct Answer: Option D

Explanation:
Combine ratios: a:b = 7:4, b:c = 4:10 ⇒ a:b:c = 7:4:10.

This question belongs to: Maths Ratio and Proportion

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