If a:b = 5:9 and b:c = 9:6, then a:b:c = ? MCQ with Answer and Explanation

If a:b = 5:9 and b:c = 9:6, then a:b:c = ?

A. 5:9:6

B. 4:9:7

C. 10:18:12

D. 5:10:6

Answer: Option A

Combine ratios: a:b = 5:9, b:c = 9:6 ⇒ a:b:c = 5:9:6.

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 6:6. After 12 years, the ratio becomes 8:7. Present age of A is?

A. 77 years

B. 144 years

C. 72 years

D. 64 years

Correct Answer: Option C

Explanation:
Let ages 6k and 6k. Then (6k + 12)/(6k + 12) = 8/7. Solving gives k ≈ 12, age of A = 6*12 = 72.

This question belongs to: Maths Ratio and Proportion

Question #2 Report Error

If a:b = 5:6 and b:c = 6:11, then a:b:c = ?

A. 4:6:12

B. 5:6:11

C. 10:12:22

D. 5:7:11

Correct Answer: Option B

Explanation:
Combine ratios: a:b = 5:6, b:c = 6:11 ⇒ a:b:c = 5:6:11.

This question belongs to: Maths Ratio and Proportion

Question #3 Report Error

If a:b = 2:8 and b:c = 8:8, then a:b:c = ?

A. 2:8:8

B. 4:16:16

C. 2:9:8

D. 1:8:9

Correct Answer: Option A

Explanation:
Combine ratios: a:b = 2:8, b:c = 8:8 ⇒ a:b:c = 2:8:8.

This question belongs to: Maths Ratio and Proportion