If a:b = 6:9 and b:c = 9:10, then a:b:c = ? MCQ with Answer and Explanation

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If a:b = 6:9 and b:c = 9:10, then a:b:c = ?

A. 6:9:10

B. 5:9:11

C. 12:18:20

D. 6:10:10

Answer: Option A

Solution (By JKSSB Mock Tests)

Combine ratios: a:b = 6:9, b:c = 9:10 ⇒ a:b:c = 6:9:10.

This question belongs to: Maths Ratio and Proportion

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Practice More Ratio and Proportion Questions

Question #1

If a:b = 7:4 and b:c = 4:4, then a:b:c = ?

A. 7:5:4

B. 14:8:8

C. 6:4:5

D. 7:4:4

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Correct Answer: Option D

Explanation:
Combine ratios: a:b = 7:4, b:c = 4:4 ⇒ a:b:c = 7:4:4.

This question belongs to: Maths Ratio and Proportion

Question #2

Two numbers are in ratio 11:9. Their difference is 111. What is their sum?

A. 560

B. 526

C. 480

D. 240

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Correct Answer: Option C

Explanation:
Numbers 11k, 9k. Difference |11-9|k = 111 ⇒ k = 55. Sum = (11+9)k ≈ 480.

This question belongs to: Maths Ratio and Proportion

Question #3

Two numbers are in ratio 7:12. Their difference is 121. What is their sum?

A. 326

B. 190

C. 218

D. 95

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Correct Answer: Option B

Explanation:
Numbers 7k, 12k. Difference |7-12|k = 121 ⇒ k = 24. Sum = (7+12)k ≈ 190.

This question belongs to: Maths Ratio and Proportion

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