If a:b = 5:3 and b:c = 3:5, then a:b:c = ? MCQ with Answer and Explanation

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If a:b = 5:3 and b:c = 3:5, then a:b:c = ?

A. 5:4:5

B. 10:6:10

C. 4:3:6

D. 5:3:5

Answer: Option D

Solution (By JKSSB Mock Tests)

Combine ratios: a:b = 5:3, b:c = 3:5 ⇒ a:b:c = 5:3:5.

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

A. 42 years

B. 47 years

C. 84 years

D. 36 years

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Correct Answer: Option A

Explanation:
Let ages 3k and 5k. Then (3k + 5)/(5k + 5) = 5/6. Solving gives k ≈ 14, age of A = 3*14 = 42.

This question belongs to: Maths Ratio and Proportion

Question #2

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If a:b = 8:4 and b:c = 4:11, then a:b:c = ?

A. 16:8:22

B. 8:4:11

C. 7:4:12

D. 8:5:11

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Correct Answer: Option B

Explanation:
Combine ratios: a:b = 8:4, b:c = 4:11 ⇒ a:b:c = 8:4:11.

This question belongs to: Maths Ratio and Proportion

Question #3

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If a:b = 3:5 and b:c = 5:5, then a:b:c = ?

A. 3:5:5

B. 2:5:6

C. 6:10:10

D. 3:6:5

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Correct Answer: Option A

Explanation:
Combine ratios: a:b = 3:5, b:c = 5:5 ⇒ a:b:c = 3:5:5.

This question belongs to: Maths Ratio and Proportion

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