If a:b = 3:7 and b:c = 7:4, then a:b:c = ? MCQ with Answer and Explanation

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If a:b = 3:7 and b:c = 7:4, then a:b:c = ?

A. 6:14:8

B. 3:8:4

C. 3:7:4

D. 2:7:5

Answer: Option C

Solution (By JKSSB Mock Tests)

Combine ratios: a:b = 3:7, b:c = 7:4 ⇒ a:b:c = 3:7:4.

This question belongs to: Maths Ratio and Proportion

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Question #1

If a:b = 3:9 and b:c = 9:10, then a:b:c = ?

A. 2:9:11

B. 3:10:10

C. 6:18:20

D. 3:9:10

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Correct Answer: Option D

Explanation:
Combine ratios: a:b = 3:9, b:c = 9:10 ⇒ a:b:c = 3:9:10.

This question belongs to: Maths Ratio and Proportion

Question #2

Two numbers are in ratio 9:7. Their difference is 120. What is their sum?

A. 489

B. 445

C. 400

D. 200

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Correct Answer: Option C

Explanation:
Numbers 9k, 7k. Difference |9-7|k = 120 ⇒ k = 60. Sum = (9+7)k ≈ 400.

This question belongs to: Maths Ratio and Proportion

Question #3

Two numbers are in ratio 9:4. Their difference is 113. What is their sum?

A. 143

B. 286

C. 395

D. 326

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Correct Answer: Option B

Explanation:
Numbers 9k, 4k. Difference |9-4|k = 113 ⇒ k = 22. Sum = (9+4)k ≈ 286.

This question belongs to: Maths Ratio and Proportion

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