If a:b = 2:7 and b:c = 7:12, then a:b:c = ? MCQ with Answer and Explanation

If a:b = 2:7 and b:c = 7:12, then a:b:c = ?

A. 4:14:24

B. 2:8:12

C. 2:7:12

D. 1:7:13

Answer: Option C

Combine ratios: a:b = 2:7, b:c = 7:12 ⇒ a:b:c = 2:7:12.

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 5:7. After 4 years, the ratio becomes 8:8. Present age of A is?

A. 50 years

B. 42 years

C. 90 years

D. 45 years

Correct Answer: Option D

Explanation:
Let ages 5k and 7k. Then (5k + 4)/(7k + 4) = 8/8. Solving gives k ≈ 9, age of A = 5*9 = 45.

This question belongs to: Maths Ratio and Proportion

Question #2 Report Error

If a:b = 2:10 and b:c = 10:12, then a:b:c = ?

A. 2:10:12

B. 2:11:12

C. 4:20:24

D. 1:10:13

Correct Answer: Option A

Explanation:
Combine ratios: a:b = 2:10, b:c = 10:12 ⇒ a:b:c = 2:10:12.

This question belongs to: Maths Ratio and Proportion

Question #3 Report Error

If a:b = 6:7 and b:c = 7:12, then a:b:c = ?

A. 6:7:12

B. 5:7:13

C. 12:14:24

D. 6:8:12

Correct Answer: Option A

Explanation:
Combine ratios: a:b = 6:7, b:c = 7:12 ⇒ a:b:c = 6:7:12.

This question belongs to: Maths Ratio and Proportion