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. 6:10:12

C. 3:5:6

D. 2:5:7

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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Practice More Ratio and Proportion Questions

Question #1

Find the mean proportional between 4 and 32.

A. 22

B. 11

C. 14

D. 36

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Correct Answer: Option B

Explanation:
Mean proportional = √(4 × 32) = √(128) = 11.

This question belongs to: Maths Ratio and Proportion

Question #2

Two numbers are in the ratio 12:8 and their sum is 523. Find the numbers.

A. 312 and 208

B. 333 and 191

C. 294 and 220

D. 624 and 416

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Correct Answer: Option A

Explanation:
Numbers = 12k and 8k. 12k + 8k = 523 ⇒ k = 26. Thus, numbers are 312 and 208.

This question belongs to: Maths Ratio and Proportion

Question #3

If a:b = 7:9 and b:c = 9:8, then a:b:c = ?

A. 14:18:16

B. 6:9:9

C. 7:10:8

D. 7:9:8

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Correct Answer: Option D

Explanation:
Combine ratios: a:b = 7:9, b:c = 9:8 ⇒ a:b:c = 7:9:8.

This question belongs to: Maths Ratio and Proportion

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