Ratio of present ages of A and B is 5:7. After 6 years, the ratio becomes 6:10. 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 6 years, the ratio becomes 6:10. Present age of A is?

A. 125 years

B. 121 years

C. 130 years

D. 250 years

Answer: Option A

Solution (By JKSSB Mock Tests)

Let ages 5k and 7k. Then (5k + 6)/(7k + 6) = 6/10. Solving gives k ≈ 25, age of A = 5*25 = 125.

This question belongs to: Maths Ratio and Proportion

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Practice More Ratio and Proportion Questions

Question #1

Find the mean proportional between 28 and 14.

A. 19

B. 22

C. 38

D. 42

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Correct Answer: Option A

Explanation:
Mean proportional = √(28 × 14) = √(392) = 19.

This question belongs to: Maths Ratio and Proportion

Question #2

If a:b = 5:7 and b:c = 7:5, then a:b:c = ?

A. 5:7:5

B. 5:8:5

C. 10:14:10

D. 4:7:6

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Correct Answer: Option A

Explanation:
Combine ratios: a:b = 5:7, b:c = 7:5 ⇒ a:b:c = 5:7:5.

This question belongs to: Maths Ratio and Proportion

Question #3

Two numbers are in the ratio 4:5 and their sum is 398. Find the numbers.

A. 352 and 440

B. 176 and 220

C. 157 and 225

D. 190 and 207

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Correct Answer: Option B

Explanation:
Numbers = 4k and 5k. 4k + 5k = 398 ⇒ k = 44. Thus, numbers are 176 and 220.

This question belongs to: Maths Ratio and Proportion

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