If a:b = 7:9 and b:c = 9:5, then a:b:c = ? MCQ with Answer and Explanation

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If a:b = 7:9 and b:c = 9:5, then a:b:c = ?

A. 7:9:5

B. 14:18:10

C. 6:9:6

D. 7:10:5

Answer: Option A

Solution (By JKSSB Mock Tests)

Combine ratios: a:b = 7:9, b:c = 9:5 ⇒ a:b:c = 7:9:5.

This question belongs to: Maths Ratio and Proportion

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Question #1

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Two numbers are in ratio 9:12. Their difference is 74. What is their sum?

A. 210

B. 105

C. 355

D. 270

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Correct Answer: Option A

Explanation:
Numbers 9k, 12k. Difference |9-12|k = 74 ⇒ k = 24. Sum = (9+12)k ≈ 210.

This question belongs to: Maths Ratio and Proportion

Question #2

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If a:b = 7:5 and b:c = 5:8, then a:b:c = ?

A. 6:5:9

B. 7:6:8

C. 7:5:8

D. 14:10:16

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Correct Answer: Option C

Explanation:
Combine ratios: a:b = 7:5, b:c = 5:8 ⇒ a:b:c = 7:5:8.

This question belongs to: Maths Ratio and Proportion

Question #3

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Milk and water are in ratio 4:3 in a 255 L mixture. Quantity of milk?

A. 145 L

B. 191 L

C. 110 L

D. 290 L

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Correct Answer: Option A

Explanation:
Total parts = 7. Milk = [4 / (4+3)] × 255 = 145 L.

This question belongs to: Maths Ratio and Proportion

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