Ratio of present ages of A and B is 6:4. After 5 years, the ratio becomes 9:7. Present age of A is? MCQ with Answer and Explanation

Ratio of present ages of A and B is 6:4. After 5 years, the ratio becomes 9:7. Present age of A is?

A. 114 years

B. 228 years

C. 108 years

D. 119 years

Answer: Option A

Let ages 6k and 4k. Then (6k + 5)/(4k + 5) = 9/7. Solving gives k ≈ 19, age of A = 6*19 = 114.

This question belongs to: Maths Ratio and Proportion

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Question #1 Report Error

Ratio of present ages of A and B is 5:4. After 12 years, the ratio becomes 8:5. Present age of A is?

A. 120 years

B. 111 years

C. 115 years

D. 230 years

Correct Answer: Option C

Explanation:
Let ages 5k and 4k. Then (5k + 12)/(4k + 12) = 8/5. Solving gives k ≈ 23, age of A = 5*23 = 115.

This question belongs to: Maths Ratio and Proportion

Question #2 Report Error

If a:b = 4:9 and b:c = 9:10, then a:b:c = ?

A. 4:10:10

B. 4:9:10

C. 8:18:20

D. 3:9:11

Correct Answer: Option B

Explanation:
Combine ratios: a:b = 4:9, b:c = 9:10 ⇒ a:b:c = 4:9:10.

This question belongs to: Maths Ratio and Proportion

Question #3 Report Error

If a:b = 4:9 and b:c = 9:8, then a:b:c = ?

A. 4:9:8

B. 4:10:8

C. 3:9:9

D. 8:18:16

Correct Answer: Option A

Explanation:
Combine ratios: a:b = 4:9, b:c = 9:8 ⇒ a:b:c = 4:9:8.

This question belongs to: Maths Ratio and Proportion