Ratio of present ages of A and B is 5:7. After 12 years, the ratio becomes 7:10. Present age of A is? MCQ with Answer and Explanation

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Ratio of present ages of A and B is 5:7. After 12 years, the ratio becomes 7:10. Present age of A is?

A. 90 years

B. 81 years

C. 170 years

D. 85 years

Answer: Option D

Solution (By JKSSB Mock Tests)

Let ages 5k and 7k. Then (5k + 12)/(7k + 12) = 7/10. Solving gives k ≈ 17, age of A = 5*17 = 85.

This question belongs to: Maths Ratio and Proportion

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Question #1

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Two numbers are in ratio 10:6. Their difference is 122. What is their sum?

A. 544

B. 272

C. 582

D. 630

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Correct Answer: Option A

Explanation:
Numbers 10k, 6k. Difference |10-6|k = 122 ⇒ k = 30. Sum = (10+6)k ≈ 544.

This question belongs to: Maths Ratio and Proportion

Question #2

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Milk and water are in ratio 9:7 in a 533 L mixture. Quantity of milk?

A. 234 L

B. 299 L

C. 598 L

D. 336 L

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Correct Answer: Option B

Explanation:
Total parts = 16. Milk = [9 / (9+7)] × 533 = 299 L.

This question belongs to: Maths Ratio and Proportion

Question #3

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If a:b = 4:6 and b:c = 6:10, then a:b:c = ?

A. 4:7:10

B. 8:12:20

C. 4:6:10

D. 3:6:11

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Correct Answer: Option C

Explanation:
Combine ratios: a:b = 4:6, b:c = 6:10 ⇒ a:b:c = 4:6:10.

This question belongs to: Maths Ratio and Proportion

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