Ratio of present ages of A and B is 7:5. After 7 years, the ratio becomes 10:8. Present age of A is? MCQ with Answer and Explanation

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Ratio of present ages of A and B is 7:5. After 7 years, the ratio becomes 10:8. Present age of A is?

A. 131 years

B. 252 years

C. 123 years

D. 126 years

Answer: Option D

Solution (By JKSSB Mock Tests)

Let ages 7k and 5k. Then (7k + 7)/(5k + 7) = 10/8. Solving gives k ≈ 18, age of A = 7*18 = 126.

This question belongs to: Maths Ratio and Proportion

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Question #1

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Milk and water are in ratio 3:7 in a 391 L mixture. Quantity of milk?

A. 153 L

B. 274 L

C. 117 L

D. 234 L

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Correct Answer: Option C

Explanation:
Total parts = 10. Milk = [3 / (3+7)] × 391 = 117 L.

This question belongs to: Maths Ratio and Proportion

Question #2

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

A. 408 and 340

B. 429 and 320

C. 816 and 680

D. 396 and 345

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Correct Answer: Option A

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 #3

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

A. 7:9:6

B. 16:18:10

C. 8:9:5

D. 8:10:5

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Correct Answer: Option C

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

This question belongs to: Maths Ratio and Proportion

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