If a:b = 2:8 and b:c = 8:11, then a:b:c = ? MCQ with Answer and Explanation

If a:b = 2:8 and b:c = 8:11, then a:b:c = ?

A. 2:9:11

B. 1:8:12

C. 4:16:22

D. 2:8:11

Answer: Option D

Combine ratios: a:b = 2:8, b:c = 8:11 ⇒ a:b:c = 2:8:11.

This question belongs to: Maths Ratio and Proportion

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Question #1 Report Error

Two numbers are in the ratio 13:11 and their sum is 287. Find the numbers.

A. 143 and 121

B. 158 and 106

C. 286 and 242

D. 138 and 127

Correct Answer: Option A

Explanation:
Numbers = 13k and 11k. 13k + 11k = 287 ⇒ k = 11. Thus, numbers are 143 and 121.

This question belongs to: Maths Ratio and Proportion

Question #2 Report Error

Find the mean proportional between 14 and 77.

A. 64

B. 91

C. 35

D. 32

Correct Answer: Option D

Explanation:
Mean proportional = √(14 × 77) = √(1078) = 32.

This question belongs to: Maths Ratio and Proportion

Question #3 Report Error

Find the mean proportional between 7 and 9.

A. 14

B. 7

C. 10

D. 16

Correct Answer: Option B

Explanation:
Mean proportional = √(7 × 9) = √(63) = 7.

This question belongs to: Maths Ratio and Proportion