If a:b = 3:6 and b:c = 6:4, then a:b:c = ? MCQ with Answer and Explanation

If a:b = 3:6 and b:c = 6:4, then a:b:c = ?

A. 3:6:4

B. 2:6:5

C. 3:7:4

D. 6:12:8

Answer: Option A

Combine ratios: a:b = 3:6, b:c = 6:4 ⇒ a:b:c = 3:6:4.

This question belongs to: Maths Ratio and Proportion

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Question #1 Report Error

Two numbers are in the ratio 12:8 and their sum is 523. Find the numbers.

A. 312 and 208

B. 624 and 416

C. 294 and 220

D. 333 and 191

Correct Answer: Option A

Explanation:
Numbers = 12k and 8k. 12k + 8k = 523 ⇒ k = 26. Thus, numbers are 312 and 208.

This question belongs to: Maths Ratio and Proportion

Question #2 Report Error

If a:b = 7:3 and b:c = 3:8, then a:b:c = ?

A. 14:6:16

B. 7:3:8

C. 7:4:8

D. 6:3:9

Correct Answer: Option B

Explanation:
Combine ratios: a:b = 7:3, b:c = 3:8 ⇒ a:b:c = 7:3:8.

This question belongs to: Maths Ratio and Proportion

Question #3 Report Error

Ratio of present ages of A and B is 3:4. After 4 years, the ratio becomes 5:6. Present age of A is?

A. 71 years

B. 132 years

C. 60 years

D. 66 years

Correct Answer: Option D

Explanation:
Let ages 3k and 4k. Then (3k + 4)/(4k + 4) = 5/6. Solving gives k ≈ 22, age of A = 3*22 = 66.

This question belongs to: Maths Ratio and Proportion