Ratio of present ages of A and B is 4:7. After 11 years, the ratio becomes 5:8. Present age of A is? MCQ with Answer and Explanation

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Ratio of present ages of A and B is 4:7. After 11 years, the ratio becomes 5:8. Present age of A is?

A. 36 years

B. 45 years

C. 40 years

D. 80 years

Answer: Option C

Solution (By JKSSB Mock Tests)

Let ages 4k and 7k. Then (4k + 11)/(7k + 11) = 5/8. Solving gives k ≈ 10, age of A = 4*10 = 40.

This question belongs to: Maths Ratio and Proportion

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Practice More Ratio and Proportion Questions

Question #1

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

A. 3:6:5

B. 6:10:10

C. 2:5:6

D. 3:5:5

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Correct Answer: Option D

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

This question belongs to: Maths Ratio and Proportion

Question #2

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

A. 6:4:5

B. 5:4:6

C. 6:5:5

D. 12:8:10

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Correct Answer: Option A

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

This question belongs to: Maths Ratio and Proportion

Question #3

If a:b = 2:9 and b:c = 9:4, then a:b:c = ?

A. 4:18:8

B. 1:9:5

C. 2:10:4

D. 2:9:4

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Correct Answer: Option D

Explanation:
Combine ratios: a:b = 2:9, b:c = 9:4 ⇒ a:b:c = 2:9:4.

This question belongs to: Maths Ratio and Proportion

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