If a:b = 4:8 and b:c = 8:7, then a:b:c = ? MCQ with Answer and Explanation

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If a:b = 4:8 and b:c = 8:7, then a:b:c = ?

A. 4:9:7

B. 3:8:8

C. 4:8:7

D. 8:16:14

Answer: Option C

Solution (By JKSSB Mock Tests)

Combine ratios: a:b = 4:8, b:c = 8:7 ⇒ a:b:c = 4:8:7.

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 6:7. After 6 years, the ratio becomes 7:8. Present age of A is?

A. 59 years

B. 108 years

C. 54 years

D. 47 years

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Correct Answer: Option C

Explanation:
Let ages 6k and 7k. Then (6k + 6)/(7k + 6) = 7/8. Solving gives k ≈ 9, age of A = 6*9 = 54.

This question belongs to: Maths Ratio and Proportion

Question #2

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If a:b = 3:9 and b:c = 9:12, then a:b:c = ?

A. 3:10:12

B. 3:9:12

C. 2:9:13

D. 6:18:24

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Correct Answer: Option B

Explanation:
Combine ratios: a:b = 3:9, b:c = 9:12 ⇒ a:b:c = 3:9:12.

This question belongs to: Maths Ratio and Proportion

Question #3

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If a:b = 5:4 and b:c = 4:5, then a:b:c = ?

A. 4:4:6

B. 5:4:5

C. 10:8:10

D. 5:5:5

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Correct Answer: Option B

Explanation:
Combine ratios: a:b = 5:4, b:c = 4:5 ⇒ a:b:c = 5:4:5.

This question belongs to: Maths Ratio and Proportion

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