If a:b = 5:9 and b:c = 9:7, then a:b:c = ? MCQ with Answer and Explanation

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If a:b = 5:9 and b:c = 9:7, then a:b:c = ?

A. 4:9:8

B. 5:10:7

C. 10:18:14

D. 5:9:7

Answer: Option D

Solution (By JKSSB Mock Tests)

Combine ratios: a:b = 5:9, b:c = 9:7 ⇒ a:b:c = 5:9:7.

This question belongs to: Maths Ratio and Proportion

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Question #1

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Two numbers are in the ratio 7:4 and their sum is 257. Find the numbers.

A. 176 and 65

B. 143 and 110

C. 322 and 184

D. 161 and 92

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Correct Answer: Option D

Explanation:
Numbers = 7k and 4k. 7k + 4k = 257 ⇒ k = 23. Thus, numbers are 161 and 92.

This question belongs to: Maths Ratio and Proportion

Question #2

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If a:b = 8:3 and b:c = 3:4, then a:b:c = ?

A. 8:4:4

B. 16:6:8

C. 7:3:5

D. 8:3:4

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Correct Answer: Option D

Explanation:
Combine ratios: a:b = 8:3, b:c = 3:4 ⇒ a:b:c = 8:3:4.

This question belongs to: Maths Ratio and Proportion

Question #3

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If a:b = 4:6 and b:c = 6:12, then a:b:c = ?

A. 4:7:12

B. 4:6:12

C. 3:6:13

D. 8:12:24

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Correct Answer: Option B

Explanation:
Combine ratios: a:b = 4:6, b:c = 6:12 ⇒ a:b:c = 4:6:12.

This question belongs to: Maths Ratio and Proportion

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