If a:b = 5:3 and b:c = 3:7, then a:b:c = ? MCQ with Answer and Explanation

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If a:b = 5:3 and b:c = 3:7, then a:b:c = ?

A. 5:3:7

B. 10:6:14

C. 4:3:8

D. 5:4:7

Answer: Option A

Solution (By JKSSB Mock Tests)

Combine ratios: a:b = 5:3, b:c = 3:7 ⇒ a:b:c = 5:3:7.

This question belongs to: Maths Ratio and Proportion

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Question #1

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

A. 4:9:8

B. 3:8:9

C. 4:8:8

D. 8:16:16

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Correct Answer: Option C

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

This question belongs to: Maths Ratio and Proportion

Question #2

Two numbers are in the ratio 10:13 and their sum is 454. Find the numbers.

A. 204 and 226

B. 174 and 258

C. 380 and 494

D. 190 and 247

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Correct Answer: Option D

Explanation:
Numbers = 10k and 13k. 10k + 13k = 454 ⇒ k = 19. Thus, numbers are 190 and 247.

This question belongs to: Maths Ratio and Proportion

Question #3

If a:b = 5:4 and b:c = 4:6, then a:b:c = ?

A. 10:8:12

B. 4:4:7

C. 5:4:6

D. 5:5:6

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Correct Answer: Option C

Explanation:
Combine ratios: a:b = 5:4, b:c = 4:6 ⇒ a:b:c = 5:4:6.

This question belongs to: Maths Ratio and Proportion

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