Ratio of present ages of A and B is 4:5. After 4 years, the ratio becomes 6:7. Present age of A is? MCQ with Answer and Explanation

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Ratio of present ages of A and B is 4:5. After 4 years, the ratio becomes 6:7. Present age of A is?

A. 120 years

B. 60 years

C. 55 years

D. 65 years

Answer: Option B

Solution (By JKSSB Mock Tests)

Let ages 4k and 5k. Then (4k + 4)/(5k + 4) = 6/7. Solving gives k ≈ 15, age of A = 4*15 = 60.

This question belongs to: Maths Ratio and Proportion

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Practice More Ratio and Proportion Questions

Question #1

If a:b = 6:5 and b:c = 5:11, then a:b:c = ?

A. 6:5:11

B. 5:5:12

C. 12:10:22

D. 6:6:11

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Correct Answer: Option A

Explanation:
Combine ratios: a:b = 6:5, b:c = 5:11 ⇒ a:b:c = 6:5:11.

This question belongs to: Maths Ratio and Proportion

Question #2

If a:b = 3:6 and b:c = 6:4, then a:b:c = ?

A. 6:12:8

B. 2:6:5

C. 3:6:4

D. 3:7:4

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Correct Answer: Option C

Explanation:
Combine ratios: a:b = 3:6, b:c = 6:4 ⇒ a:b:c = 3:6:4.

This question belongs to: Maths Ratio and Proportion

Question #3

Two numbers are in the ratio 12:15 and their sum is 313. Find the numbers.

A. 132 and 165

B. 156 and 136

C. 264 and 330

D. 117 and 176

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Correct Answer: Option A

Explanation:
Numbers = 12k and 15k. 12k + 15k = 313 ⇒ k = 11. Thus, numbers are 132 and 165.

This question belongs to: Maths Ratio and Proportion

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