Ratio of present ages of A and B is 4:7. After 11 years, the ratio becomes 5:8. Present age of A is? MCQ with Answer and Explanation

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Ratio of present ages of A and B is 4:7. After 11 years, the ratio becomes 5:8. Present age of A is?

A. 45 years

B. 36 years

C. 80 years

D. 40 years

Answer: Option D

Solution (By JKSSB Mock Tests)

Let ages 4k and 7k. Then (4k + 11)/(7k + 11) = 5/8. Solving gives k ≈ 10, age of A = 4*10 = 40.

This question belongs to: Maths Ratio and Proportion

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Question #1

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Milk and water are in ratio 6:4 in a 289 L mixture. Quantity of milk?

A. 223 L

B. 346 L

C. 173 L

D. 116 L

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Correct Answer: Option C

Explanation:
Total parts = 10. Milk = [6 / (6+4)] × 289 = 173 L.

This question belongs to: Maths Ratio and Proportion

Question #2

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Find the mean proportional between 14 and 77.

A. 91

B. 35

C. 32

D. 64

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Correct Answer: Option C

Explanation:
Mean proportional = √(14 × 77) = √(1078) = 32.

This question belongs to: Maths Ratio and Proportion

Question #3

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If a:b = 6:7 and b:c = 7:4, then a:b:c = ?

A. 5:7:5

B. 6:8:4

C. 6:7:4

D. 12:14:8

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Correct Answer: Option C

Explanation:
Combine ratios: a:b = 6:7, b:c = 7:4 ⇒ a:b:c = 6:7:4.

This question belongs to: Maths Ratio and Proportion

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