If a:b = 4:5 and b:c = 5:8, then a:b:c = ? MCQ with Answer and Explanation

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If a:b = 4:5 and b:c = 5:8, then a:b:c = ?

A. 3:5:9

B. 4:6:8

C. 4:5:8

D. 8:10:16

Answer: Option C

Solution (By JKSSB Mock Tests)

Combine ratios: a:b = 4:5, b:c = 5:8 ⇒ a:b:c = 4:5:8.

This question belongs to: Maths Ratio and Proportion

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Question #1

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Two numbers are in the ratio 15:6 and their sum is 521. Find the numbers.

A. 720 and 288

B. 360 and 144

C. 347 and 158

D. 375 and 127

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Correct Answer: Option B

Explanation:
Numbers = 15k and 6k. 15k + 6k = 521 ⇒ k = 24. Thus, numbers are 360 and 144.

This question belongs to: Maths Ratio and Proportion

Question #2

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Find the mean proportional between 24 and 76.

A. 84

B. 42

C. 45

D. 100

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Correct Answer: Option B

Explanation:
Mean proportional = √(24 × 76) = √(1824) = 42.

This question belongs to: Maths Ratio and Proportion

Question #3

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Two numbers are in the ratio 12:8 and their sum is 523. Find the numbers.

A. 624 and 416

B. 294 and 220

C. 333 and 191

D. 312 and 208

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Correct Answer: Option D

Explanation:
Numbers = 12k and 8k. 12k + 8k = 523 ⇒ k = 26. Thus, numbers are 312 and 208.

This question belongs to: Maths Ratio and Proportion

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