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

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

A. 4:5:10

B. 5:6:9

C. 10:10:18

D. 5:5:9

Answer: Option D

Solution (By JKExamLibrary)

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

This question belongs to: Maths Ratio and Proportion

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Question #1

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Milk and water are in ratio 6:4 in a 289 L mixture. Quantity of milk?

A. 116 L

B. 173 L

C. 223 L

D. 346 L

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Correct Answer: Option B

Explanation:
Total parts = 10. Milk = [6 / (6+4)] × 289 = 173 L.

This question belongs to: Maths Ratio and Proportion

Question #2

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Find the mean proportional between 31 and 78.

A. 109

B. 52

C. 98

D. 49

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Correct Answer: Option D

Explanation:
Mean proportional = √(31 × 78) = √(2418) = 49.

This question belongs to: Maths Ratio and Proportion

Question #3

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Two numbers are in the ratio 10:4 and their sum is 482. Find the numbers.

A. 323 and 146

B. 340 and 136

C. 680 and 272

D. 357 and 117

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Correct Answer: Option B

Explanation:
Numbers = 10k and 4k. 10k + 4k = 482 ⇒ k = 34. Thus, numbers are 340 and 136.

This question belongs to: Maths Ratio and Proportion

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