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

A. 45 years

B. 90 years

C. 50 years

D. 42 years

Answer: Option A

Solution (By JKSSB Mock Tests)

Let ages 5k and 7k. Then (5k + 4)/(7k + 4) = 8/8. Solving gives k ≈ 9, age of A = 5*9 = 45.

This question belongs to: Maths Ratio and Proportion

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Practice More Ratio and Proportion Questions

Question #1

If a:b = 8:5 and b:c = 5:4, then a:b:c = ?

A. 16:10:8

B. 8:6:4

C. 8:5:4

D. 7:5:5

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Correct Answer: Option C

Explanation:
Combine ratios: a:b = 8:5, b:c = 5:4 ⇒ a:b:c = 8:5:4.

This question belongs to: Maths Ratio and Proportion

Question #2

If a:b = 7:10 and b:c = 10:11, then a:b:c = ?

A. 14:20:22

B. 7:10:11

C. 6:10:12

D. 7:11:11

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Correct Answer: Option B

Explanation:
Combine ratios: a:b = 7:10, b:c = 10:11 ⇒ a:b:c = 7:10:11.

This question belongs to: Maths Ratio and Proportion

Question #3

Find the mean proportional between 11 and 61.

A. 50

B. 72

C. 25

D. 28

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Correct Answer: Option C

Explanation:
Mean proportional = √(11 × 61) = √(671) = 25.

This question belongs to: Maths Ratio and Proportion

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