Ratio of present ages of A and B is 5:4. After 12 years, the ratio becomes 8:5. Present age of A is? MCQ with Answer and Explanation

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Ratio of present ages of A and B is 5:4. After 12 years, the ratio becomes 8:5. Present age of A is?

A. 230 years

B. 120 years

C. 111 years

D. 115 years

Answer: Option D

Solution (By JKSSB Mock Tests)

Let ages 5k and 4k. Then (5k + 12)/(4k + 12) = 8/5. Solving gives k ≈ 23, age of A = 5*23 = 115.

This question belongs to: Maths Ratio and Proportion

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Practice More Ratio and Proportion Questions

Question #1

Find the mean proportional between 4 and 21.

A. 12

B. 9

C. 25

D. 18

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Correct Answer: Option B

Explanation:
Mean proportional = √(4 × 21) = √(84) = 9.

This question belongs to: Maths Ratio and Proportion

Question #2

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

A. 8:8:8

B. 4:4:4

C. 4:5:4

D. 3:4:5

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Correct Answer: Option B

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

This question belongs to: Maths Ratio and Proportion

Question #3

Ratio of present ages of A and B is 7:8. After 11 years, the ratio becomes 10:10. Present age of A is?

A. 156 years

B. 161 years

C. 166 years

D. 322 years

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Correct Answer: Option B

Explanation:
Let ages 7k and 8k. Then (7k + 11)/(8k + 11) = 10/10. Solving gives k ≈ 23, age of A = 7*23 = 161.

This question belongs to: Maths Ratio and Proportion

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