Ratio of present ages of A and B is 4:8. After 6 years, the ratio becomes 5:10. Present age of A is? MCQ with Answer and Explanation

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Ratio of present ages of A and B is 4:8. After 6 years, the ratio becomes 5:10. Present age of A is?

A. 56 years

B. 52 years

C. 61 years

D. 112 years

Answer: Option A

Solution (By JKSSB Mock Tests)

Let ages 4k and 8k. Then (4k + 6)/(8k + 6) = 5/10. Solving gives k ≈ 14, age of A = 4*14 = 56.

This question belongs to: Maths Ratio and Proportion

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Question #1

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Two numbers are in ratio 6:4. Their difference is 60. What is their sum?

A. 381

B. 497

C. 175

D. 350

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Correct Answer: Option D

Explanation:
Numbers 6k, 4k. Difference |6-4|k = 60 ⇒ k = 30. Sum = (6+4)k ≈ 350.

This question belongs to: Maths Ratio and Proportion

Question #2

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If a:b = 3:8 and b:c = 8:4, then a:b:c = ?

A. 3:8:4

B. 6:16:8

C. 3:9:4

D. 2:8:5

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Correct Answer: Option A

Explanation:
Combine ratios: a:b = 3:8, b:c = 8:4 ⇒ a:b:c = 3:8:4.

This question belongs to: Maths Ratio and Proportion

Question #3

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Find the mean proportional between 24 and 76.

A. 45

B. 42

C. 100

D. 84

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Correct Answer: Option B

Explanation:
Mean proportional = √(24 × 76) = √(1824) = 42.

This question belongs to: Maths Ratio and Proportion

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