If a:b = 7:4 and b:c = 4:8, then a:b:c = ? MCQ with Answer and Explanation

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If a:b = 7:4 and b:c = 4:8, then a:b:c = ?

A. 6:4:9

B. 7:5:8

C. 7:4:8

D. 14:8:16

Answer: Option C

Solution (By JKSSB Mock Tests)

Combine ratios: a:b = 7:4, b:c = 4:8 ⇒ a:b:c = 7:4:8.

This question belongs to: Maths Ratio and Proportion

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Question #1

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Two numbers are in the ratio 3:14 and their sum is 614. Find the numbers.

A. 99 and 524

B. 118 and 488

C. 216 and 1008

D. 108 and 504

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Correct Answer: Option D

Explanation:
Numbers = 3k and 14k. 3k + 14k = 614 ⇒ k = 36. Thus, numbers are 108 and 504.

This question belongs to: Maths Ratio and Proportion

Question #2

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If a:b = 6:9 and b:c = 9:9, then a:b:c = ?

A. 12:18:18

B. 6:10:9

C. 5:9:10

D. 6:9:9

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Correct Answer: Option D

Explanation:
Combine ratios: a:b = 6:9, b:c = 9:9 ⇒ a:b:c = 6:9:9.

This question belongs to: Maths Ratio and Proportion

Question #3

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If a:b = 2:8 and b:c = 8:4, then a:b:c = ?

A. 1:8:5

B. 4:16:8

C. 2:8:4

D. 2:9:4

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Correct Answer: Option C

Explanation:
Combine ratios: a:b = 2:8, b:c = 8:4 ⇒ a:b:c = 2:8:4.

This question belongs to: Maths Ratio and Proportion

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