If a:b = 4:3 and b:c = 3:10, then a:b:c = ? MCQ with Answer and Explanation

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If a:b = 4:3 and b:c = 3:10, then a:b:c = ?

A. 3:3:11

B. 8:6:20

C. 4:4:10

D. 4:3:10

Answer: Option D

Solution (By JKSSB Mock Tests)

Combine ratios: a:b = 4:3, b:c = 3:10 ⇒ a:b:c = 4:3:10.

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 3:4. After 4 years, the ratio becomes 5:6. Present age of A is?

A. 71 years

B. 66 years

C. 132 years

D. 60 years

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Correct Answer: Option B

Explanation:
Let ages 3k and 4k. Then (3k + 4)/(4k + 4) = 5/6. Solving gives k ≈ 22, age of A = 3*22 = 66.

This question belongs to: Maths Ratio and Proportion

Question #2

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

A. 7:4:5

B. 8:5:4

C. 8:4:4

D. 16:8:8

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Correct Answer: Option C

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

This question belongs to: Maths Ratio and Proportion

Question #3

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If a:b = 5:8 and b:c = 8:9, then a:b:c = ?

A. 5:9:9

B. 4:8:10

C. 10:16:18

D. 5:8:9

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Correct Answer: Option D

Explanation:
Combine ratios: a:b = 5:8, b:c = 8:9 ⇒ a:b:c = 5:8:9.

This question belongs to: Maths Ratio and Proportion

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