If a:b = 3:5 and b:c = 5:6, then a:b:c = ? MCQ with Answer and Explanation

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If a:b = 3:5 and b:c = 5:6, then a:b:c = ?

A. 3:6:6

B. 2:5:7

C. 3:5:6

D. 6:10:12

Answer: Option C

Solution (By JKSSB Mock Tests)

Combine ratios: a:b = 3:5, b:c = 5:6 ⇒ a:b:c = 3:5:6.

This question belongs to: Maths Ratio and Proportion

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Question #1

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Ratio of present ages of A and B is 4:6. After 8 years, the ratio becomes 6:9. Present age of A is?

A. 44 years

B. 88 years

C. 49 years

D. 36 years

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Correct Answer: Option A

Explanation:
Let ages 4k and 6k. Then (4k + 8)/(6k + 8) = 6/9. Solving gives k ≈ 11, age of A = 4*11 = 44.

This question belongs to: Maths Ratio and Proportion

Question #2

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If a:b = 7:10 and b:c = 10:11, then a:b:c = ?

A. 6:10:12

B. 7:11:11

C. 14:20:22

D. 7:10:11

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Correct Answer: Option D

Explanation:
Combine ratios: a:b = 7:10, b:c = 10:11 ⇒ a:b:c = 7:10:11.

This question belongs to: Maths Ratio and Proportion

Question #3

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If a:b = 6:9 and b:c = 9:11, then a:b:c = ?

A. 12:18:22

B. 6:9:11

C. 5:9:12

D. 6:10:11

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Correct Answer: Option B

Explanation:
Combine ratios: a:b = 6:9, b:c = 9:11 ⇒ a:b:c = 6:9:11.

This question belongs to: Maths Ratio and Proportion

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