If a:b = 3:9 and b:c = 9:7, then a:b:c = ? MCQ with Answer and Explanation

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If a:b = 3:9 and b:c = 9:7, then a:b:c = ?

A. 2:9:8

B. 3:10:7

C. 3:9:7

D. 6:18:14

Answer: Option C

Solution (By JKSSB Mock Tests)

Combine ratios: a:b = 3:9, b:c = 9:7 ⇒ a:b:c = 3:9:7.

This question belongs to: Maths Ratio and Proportion

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Question #1

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

A. 3:6:7

B. 8:12:12

C. 4:7:6

D. 4:6:6

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Correct Answer: Option D

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

This question belongs to: Maths Ratio and Proportion

Question #2

Two numbers are in ratio 12:7. Their difference is 51. What is their sum?

A. 596

B. 456

C. 504

D. 228

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Correct Answer: Option B

Explanation:
Numbers 12k, 7k. Difference |12-7|k = 51 ⇒ k = 10. Sum = (12+7)k ≈ 456.

This question belongs to: Maths Ratio and Proportion

Question #3

Find the mean proportional between 11 and 61.

A. 28

B. 72

C. 50

D. 25

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Correct Answer: Option D

Explanation:
Mean proportional = √(11 × 61) = √(671) = 25.

This question belongs to: Maths Ratio and Proportion

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