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

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

A. 10:6:10

B. 4:3:6

C. 5:3:5

D. 5:4:5

Answer: Option C

Solution (By JKSSB Mock Tests)

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

This question belongs to: Maths Ratio and Proportion

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Question #1

If a:b = 2:10 and b:c = 10:12, then a:b:c = ?

A. 2:10:12

B. 4:20:24

C. 2:11:12

D. 1:10:13

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Correct Answer: Option A

Explanation:
Combine ratios: a:b = 2:10, b:c = 10:12 ⇒ a:b:c = 2:10:12.

This question belongs to: Maths Ratio and Proportion

Question #2

Two numbers are in the ratio 12:15 and their sum is 313. Find the numbers.

A. 156 and 136

B. 264 and 330

C. 117 and 176

D. 132 and 165

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Correct Answer: Option D

Explanation:
Numbers = 12k and 15k. 12k + 15k = 313 ⇒ k = 11. Thus, numbers are 132 and 165.

This question belongs to: Maths Ratio and Proportion

Question #3

Two numbers are in ratio 9:5. Their difference is 105. What is their sum?

A. 574

B. 684

C. 287

D. 633

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Correct Answer: Option A

Explanation:
Numbers 9k, 5k. Difference |9-5|k = 105 ⇒ k = 26. Sum = (9+5)k ≈ 574.

This question belongs to: Maths Ratio and Proportion

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