If a:b = 5:6 and b:c = 6:7, then a:b:c = ? MCQ with Answer and Explanation

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If a:b = 5:6 and b:c = 6:7, then a:b:c = ?

A. 5:7:7

B. 10:12:14

C. 5:6:7

D. 4:6:8

Answer: Option C

Solution (By JKExamLibrary)

Combine ratios: a:b = 5:6, b:c = 6:7 ⇒ a:b:c = 5:6:7.

This question belongs to: Maths Ratio and Proportion

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Question #1 Report Error

If a:b = 4:5 and b:c = 5:12, then a:b:c = ?

A. 8:10:24

B. 4:6:12

C. 3:5:13

D. 4:5:12

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Correct Answer: Option D

Explanation:
Combine ratios: a:b = 4:5, b:c = 5:12 ⇒ a:b:c = 4:5:12.

This question belongs to: Maths Ratio and Proportion

Question #2 Report Error

If a:b = 2:5 and b:c = 5:10, then a:b:c = ?

A. 4:10:20

B. 1:5:11

C. 2:6:10

D. 2:5:10

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Correct Answer: Option D

Explanation:
Combine ratios: a:b = 2:5, b:c = 5:10 ⇒ a:b:c = 2:5:10.

This question belongs to: Maths Ratio and Proportion

Question #3 Report Error

Find the mean proportional between 19 and 14.

A. 19

B. 33

C. 32

D. 16

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Correct Answer: Option D

Explanation:
Mean proportional = √(19 × 14) = √(266) = 16.

This question belongs to: Maths Ratio and Proportion

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