Ratio of present ages of A and B is 3:7. After 5 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 3:7. After 5 years, the ratio becomes 5:10. Present age of A is?

A. 77 years

B. 72 years

C. 65 years

D. 144 years

Answer: Option B

Solution (By JKSSB Mock Tests)

Let ages 3k and 7k. Then (3k + 5)/(7k + 5) = 5/10. Solving gives k ≈ 24, age of A = 3*24 = 72.

This question belongs to: Maths Ratio and Proportion

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Question #1

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Two numbers are in ratio 7:12. Their difference is 101. What is their sum?

A. 334

B. 423

C. 304

D. 152

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Correct Answer: Option C

Explanation:
Numbers 7k, 12k. Difference |7-12|k = 101 ⇒ k = 20. Sum = (7+12)k ≈ 304.

This question belongs to: Maths Ratio and Proportion

Question #2

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If a:b = 3:3 and b:c = 3:12, then a:b:c = ?

A. 2:3:13

B. 6:6:24

C. 3:3:12

D. 3:4:12

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Correct Answer: Option C

Explanation:
Combine ratios: a:b = 3:3, b:c = 3:12 ⇒ a:b:c = 3:3:12.

This question belongs to: Maths Ratio and Proportion

Question #3

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If a:b = 5:8 and b:c = 8:9, then a:b:c = ?

A. 10:16:18

B. 5:9:9

C. 5:8:9

D. 4:8:10

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Correct Answer: Option C

Explanation:
Combine ratios: a:b = 5:8, b:c = 8:9 ⇒ a:b:c = 5:8:9.

This question belongs to: Maths Ratio and Proportion

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