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. 7:5:8

B. 14:8:16

C. 6:4:9

D. 7:4:8

Answer: Option D

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 7:4 and their sum is 257. Find the numbers.

A. 143 and 110

B. 322 and 184

C. 161 and 92

D. 176 and 65

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Correct Answer: Option C

Explanation:
Numbers = 7k and 4k. 7k + 4k = 257 ⇒ k = 23. Thus, numbers are 161 and 92.

This question belongs to: Maths Ratio and Proportion

Question #2

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Two numbers are in the ratio 10:13 and their sum is 454. Find the numbers.

A. 380 and 494

B. 204 and 226

C. 190 and 247

D. 174 and 258

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Correct Answer: Option C

Explanation:
Numbers = 10k and 13k. 10k + 13k = 454 ⇒ k = 19. Thus, numbers are 190 and 247.

This question belongs to: Maths Ratio and Proportion

Question #3

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If a:b = 6:3 and b:c = 3:12, then a:b:c = ?

A. 12:6:24

B. 6:4:12

C. 5:3:13

D. 6:3:12

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Correct Answer: Option D

Explanation:
Combine ratios: a:b = 6:3, b:c = 3:12 ⇒ a:b:c = 6:3:12.

This question belongs to: Maths Ratio and Proportion

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