If a:b = 4:5 and b:c = 5:5, then a:b:c = ? MCQ with Answer and Explanation

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If a:b = 4:5 and b:c = 5:5, then a:b:c = ?

A. 3:5:6

B. 4:6:5

C. 8:10:10

D. 4:5:5

Answer: Option D

Solution (By JKExamLibrary)

Combine ratios: a:b = 4:5, b:c = 5:5 ⇒ a:b:c = 4:5:5.

This question belongs to: Maths Ratio and Proportion

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Question #1

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Milk and water are in ratio 6:6 in a 413 L mixture. Quantity of milk?

A. 412 L

B. 207 L

C. 206 L

D. 245 L

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Correct Answer: Option C

Explanation:
Total parts = 12. Milk = [6 / (6+6)] × 413 = 206 L.

This question belongs to: Maths Ratio and Proportion

Question #2

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If a:b = 2:4 and b:c = 4:6, then a:b:c = ?

A. 1:4:7

B. 4:8:12

C. 2:4:6

D. 2:5:6

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Correct Answer: Option C

Explanation:
Combine ratios: a:b = 2:4, b:c = 4:6 ⇒ a:b:c = 2:4:6.

This question belongs to: Maths Ratio and Proportion

Question #3

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Two numbers are in the ratio 12:9 and their sum is 569. Find the numbers.

A. 324 and 243

B. 341 and 215

C. 317 and 258

D. 648 and 486

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Correct Answer: Option A

Explanation:
Numbers = 12k and 9k. 12k + 9k = 569 ⇒ k = 27. Thus, numbers are 324 and 243.

This question belongs to: Maths Ratio and Proportion

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