If a:b = 5:8 and b:c = 8:7, then a:b:c = ? MCQ with Answer and Explanation

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

A. 10:16:14

B. 5:9:7

C. 4:8:8

D. 5:8:7

Answer: Option D

Solution (By JKSSB Mock Tests)

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

This question belongs to: Maths Ratio and Proportion

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Practice More Ratio and Proportion Questions

Question #1

Find the mean proportional between 19 and 78.

A. 97

B. 41

C. 76

D. 38

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Correct Answer: Option D

Explanation:
Mean proportional = √(19 × 78) = √(1482) = 38.

This question belongs to: Maths Ratio and Proportion

Question #2

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

A. 145 L

B. 191 L

C. 290 L

D. 110 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

Question #3

Two numbers are in the ratio 12:5 and their sum is 771. Find the numbers.

A. 540 and 225

B. 556 and 206

C. 1080 and 450

D. 523 and 234

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Correct Answer: Option A

Explanation:
Numbers = 12k and 5k. 12k + 5k = 771 ⇒ k = 45. Thus, numbers are 540 and 225.

This question belongs to: Maths Ratio and Proportion

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