Ratio of present ages of A and B is 5:8. After 12 years, the ratio becomes 6:11. Present age of A is? MCQ with Answer and Explanation

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Ratio of present ages of A and B is 5:8. After 12 years, the ratio becomes 6:11. Present age of A is?

A. 110 years

B. 50 years

C. 60 years

D. 55 years

Answer: Option D

Solution (By JKSSB Mock Tests)

Let ages 5k and 8k. Then (5k + 12)/(8k + 12) = 6/11. Solving gives k ≈ 11, age of A = 5*11 = 55.

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 6:4. After 5 years, the ratio becomes 9:7. Present age of A is?

A. 119 years

B. 108 years

C. 228 years

D. 114 years

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Correct Answer: Option D

Explanation:
Let ages 6k and 4k. Then (6k + 5)/(4k + 5) = 9/7. Solving gives k ≈ 19, age of A = 6*19 = 114.

This question belongs to: Maths Ratio and Proportion

Question #2

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Ratio of present ages of A and B is 5:7. After 12 years, the ratio becomes 7:10. Present age of A is?

A. 81 years

B. 85 years

C. 170 years

D. 90 years

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Correct Answer: Option B

Explanation:
Let ages 5k and 7k. Then (5k + 12)/(7k + 12) = 7/10. Solving gives k ≈ 17, age of A = 5*17 = 85.

This question belongs to: Maths Ratio and Proportion

Question #3

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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. 69 years

B. 138 years

C. 74 years

D. 66 years

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Correct Answer: Option A

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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