If a:b = 5:6 and b:c = 6:9, then a:b:c = ? MCQ with Answer and Explanation

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If a:b = 5:6 and b:c = 6:9, then a:b:c = ?

A. 5:7:9

B. 4:6:10

C. 5:6:9

D. 10:12:18

Answer: Option C

Solution (By JKSSB Mock Tests)

Combine ratios: a:b = 5:6, b:c = 6:9 ⇒ a:b:c = 5:6:9.

This question belongs to: Maths Ratio and Proportion

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Question #1

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

A. 10:8:10

B. 5:4:5

C. 4:4:6

D. 5:5:5

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Correct Answer: Option B

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

This question belongs to: Maths Ratio and Proportion

Question #2

Find the mean proportional between 16 and 72.

A. 36

B. 33

C. 88

D. 66

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Correct Answer: Option B

Explanation:
Mean proportional = √(16 × 72) = √(1152) = 33.

This question belongs to: Maths Ratio and Proportion

Question #3

Two numbers are in the ratio 13:4 and their sum is 771. Find the numbers.

A. 578 and 197

B. 585 and 180

C. 609 and 170

D. 1170 and 360

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Correct Answer: Option B

Explanation:
Numbers = 13k and 4k. 13k + 4k = 771 ⇒ k = 45. Thus, numbers are 585 and 180.

This question belongs to: Maths Ratio and Proportion

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