If a:b = 5:8 and b:c = 8:12, then a:b:c = ? MCQ with Answer and Explanation

If a:b = 5:8 and b:c = 8:12, then a:b:c = ?

A. 10:16:24

B. 4:8:13

C. 5:8:12

D. 5:9:12

Answer: Option C

Combine ratios: a:b = 5:8, b:c = 8:12 ⇒ a:b:c = 5:8:12.

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 7:5. After 7 years, the ratio becomes 10:8. Present age of A is?

A. 131 years

B. 123 years

C. 252 years

D. 126 years

Correct Answer: Option D

Explanation:
Let ages 7k and 5k. Then (7k + 7)/(5k + 7) = 10/8. Solving gives k ≈ 18, age of A = 7*18 = 126.

This question belongs to: Maths Ratio and Proportion

Question #2 Report Error

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

A. 4:4:6

B. 8:8:12

C. 4:5:6

D. 3:4:7

Correct Answer: Option A

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

This question belongs to: Maths Ratio and Proportion

Question #3 Report Error

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

A. 6:3:6

B. 5:3:7

C. 12:6:12

D. 6:4:6

Correct Answer: Option A

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

This question belongs to: Maths Ratio and Proportion