If a:b = 2:4 and b:c = 4:6, then a:b:c = ? MCQ with Answer and Explanation

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If a:b = 2:4 and b:c = 4:6, then a:b:c = ?

A. 1:4:7

B. 2:4:6

C. 2:5:6

D. 4:8:12

Answer: Option B

Solution (By JKExamLibrary)

Combine ratios: a:b = 2:4, b:c = 4:6 ⇒ a:b:c = 2:4:6.

This question belongs to: Maths Ratio and Proportion

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Question #1

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Ratio of present ages of A and B is 4:6. After 9 years, the ratio becomes 7:8. Present age of A is?

A. 176 years

B. 83 years

C. 88 years

D. 93 years

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Correct Answer: Option C

Explanation:
Let ages 4k and 6k. Then (4k + 9)/(6k + 9) = 7/8. Solving gives k ≈ 22, age of A = 4*22 = 88.

This question belongs to: Maths Ratio and Proportion

Question #2

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If a:b = 4:7 and b:c = 7:10, then a:b:c = ?

A. 4:8:10

B. 3:7:11

C. 4:7:10

D. 8:14:20

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Correct Answer: Option C

Explanation:
Combine ratios: a:b = 4:7, b:c = 7:10 ⇒ a:b:c = 4:7:10.

This question belongs to: Maths Ratio and Proportion

Question #3

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If a:b = 2:8 and b:c = 8:5, then a:b:c = ?

A. 2:9:5

B. 1:8:6

C. 2:8:5

D. 4:16:10

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Correct Answer: Option C

Explanation:
Combine ratios: a:b = 2:8, b:c = 8:5 ⇒ a:b:c = 2:8:5.

This question belongs to: Maths Ratio and Proportion

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