If a:b = 2:4 and b:c = 4:9, then a:b:c = ? MCQ with Answer and Explanation

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If a:b = 2:4 and b:c = 4:9, then a:b:c = ?

A. 1:4:10

B. 2:5:9

C. 2:4:9

D. 4:8:18

Answer: Option C

Solution (By JKSSB Mock Tests)

Combine ratios: a:b = 2:4, b:c = 4:9 ⇒ a:b:c = 2:4:9.

This question belongs to: Maths Ratio and Proportion

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Question #1

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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. 523 and 234

D. 1080 and 450

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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

Question #2

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If a:b = 8:5 and b:c = 5:6, then a:b:c = ?

A. 7:5:7

B. 8:5:6

C. 8:6:6

D. 16:10:12

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Correct Answer: Option B

Explanation:
Combine ratios: a:b = 8:5, b:c = 5:6 ⇒ a:b:c = 8:5:6.

This question belongs to: Maths Ratio and Proportion

Question #3

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Two numbers are in ratio 6:4. Their difference is 60. What is their sum?

A. 381

B. 175

C. 497

D. 350

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Correct Answer: Option D

Explanation:
Numbers 6k, 4k. Difference |6-4|k = 60 ⇒ k = 30. Sum = (6+4)k ≈ 350.

This question belongs to: Maths Ratio and Proportion

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