Ratio of present ages of A and B is 7:8. After 8 years, the ratio becomes 9:9. Present age of A is? MCQ with Answer and Explanation

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Ratio of present ages of A and B is 7:8. After 8 years, the ratio becomes 9:9. Present age of A is?

A. 145 years

B. 140 years

C. 280 years

D. 135 years

Answer: Option B

Solution (By JKSSB Mock Tests)

Let ages 7k and 8k. Then (7k + 8)/(8k + 8) = 9/9. Solving gives k ≈ 20, age of A = 7*20 = 140.

This question belongs to: Maths Ratio and Proportion

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Question #1

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Two numbers are in the ratio 12:10 and their sum is 753. Find the numbers.

A. 396 and 345

B. 408 and 340

C. 429 and 320

D. 816 and 680

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Correct Answer: Option B

Explanation:
Numbers = 12k and 10k. 12k + 10k = 753 ⇒ k = 34. Thus, numbers are 408 and 340.

This question belongs to: Maths Ratio and Proportion

Question #2

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Two numbers are in ratio 9:7. Their difference is 150. What is their sum?

A. 326

B. 144

C. 423

D. 288

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Correct Answer: Option D

Explanation:
Numbers 9k, 7k. Difference |9-7|k = 150 ⇒ k = 75. Sum = (9+7)k ≈ 288.

This question belongs to: Maths Ratio and Proportion

Question #3

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

A. 3:4:6

B. 6:8:12

C. 2:4:7

D. 3:5:6

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Correct Answer: Option A

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

This question belongs to: Maths Ratio and Proportion

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