If a:b = 2:6 and b:c = 6:12, then a:b:c = ? MCQ with Answer and Explanation

If a:b = 2:6 and b:c = 6:12, then a:b:c = ?

A. 1:6:13

B. 2:6:12

C. 2:7:12

D. 4:12:24

Answer: Option B

Combine ratios: a:b = 2:6, b:c = 6:12 ⇒ a:b:c = 2:6:12.

This question belongs to: Maths Ratio and Proportion

No comments yet. Be the first to start the discussion!

Question #1 Report Error

Ratio of present ages of A and B is 4:6. After 9 years, the ratio becomes 7:8. Present age of A is?

A. 83 years

B. 176 years

C. 93 years

D. 88 years

Correct Answer: Option D

Explanation:
Let ages 4k and 6k. Then (4k + 9)/(6k + 9) = 7/8. Solving gives k ≈ 22, age of A = 4*22 = 88.

This question belongs to: Maths Ratio and Proportion

Question #2 Report Error

If a:b = 3:9 and b:c = 9:7, then a:b:c = ?

A. 2:9:8

B. 6:18:14

C. 3:9:7

D. 3:10:7

Correct Answer: Option C

Explanation:
Combine ratios: a:b = 3:9, b:c = 9:7 ⇒ a:b:c = 3:9:7.

This question belongs to: Maths Ratio and Proportion

Question #3 Report Error

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

A. 6:7:7

B. 7:7:6

C. 14:14:12

D. 7:8:6

Correct Answer: Option B

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

This question belongs to: Maths Ratio and Proportion