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

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

A. 7:5:5

B. 14:10:10

C. 7:6:5

D. 6:5:6

Answer: Option A

Solution (By JKSSB Mock Tests)

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

This question belongs to: Maths Ratio and Proportion

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Question #1

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Two numbers are in the ratio 7:15 and their sum is 454. Find the numbers.

A. 126 and 320

B. 280 and 600

C. 140 and 300

D. 170 and 281

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Correct Answer: Option C

Explanation:
Numbers = 7k and 15k. 7k + 15k = 454 ⇒ k = 20. Thus, numbers are 140 and 300.

This question belongs to: Maths Ratio and Proportion

Question #2

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Find the mean proportional between 31 and 33.

A. 31

B. 34

C. 64

D. 62

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Correct Answer: Option A

Explanation:
Mean proportional = √(31 × 33) = √(1023) = 31.

This question belongs to: Maths Ratio and Proportion

Question #3

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If a:b = 8:9 and b:c = 9:8, then a:b:c = ?

A. 16:18:16

B. 8:10:8

C. 7:9:9

D. 8:9:8

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Correct Answer: Option D

Explanation:
Combine ratios: a:b = 8:9, b:c = 9:8 ⇒ a:b:c = 8:9:8.

This question belongs to: Maths Ratio and Proportion

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