Ratio of present ages of A and B is 7:5. After 11 years, the ratio becomes 8:7. 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 11 years, the ratio becomes 8:7. Present age of A is?

A. 102 years

B. 105 years

C. 210 years

D. 110 years

Answer: Option B

Solution (By JKSSB Mock Tests)

Let ages 7k and 5k. Then (7k + 11)/(5k + 11) = 8/7. Solving gives k ≈ 15, age of A = 7*15 = 105.

This question belongs to: Maths Ratio and Proportion

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Question #1

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Milk and water are in ratio 6:2 in a 184 L mixture. Quantity of milk?

A. 46 L

B. 159 L

C. 138 L

D. 276 L

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Correct Answer: Option C

Explanation:
Total parts = 8. Milk = [6 / (6+2)] × 184 = 138 L.

This question belongs to: Maths Ratio and Proportion

Question #2

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Two numbers are in the ratio 14:12 and their sum is 772. Find the numbers.

A. 421 and 329

B. 812 and 696

C. 406 and 348

D. 389 and 367

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Correct Answer: Option C

Explanation:
Numbers = 14k and 12k. 14k + 12k = 772 ⇒ k = 29. Thus, numbers are 406 and 348.

This question belongs to: Maths Ratio and Proportion

Question #3

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Find the mean proportional between 4 and 32.

A. 14

B. 22

C. 11

D. 36

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Correct Answer: Option C

Explanation:
Mean proportional = √(4 × 32) = √(128) = 11.

This question belongs to: Maths Ratio and Proportion

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