If a:b = 4:8 and b:c = 8:10, then a:b:c = ? MCQ with Answer and Explanation

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If a:b = 4:8 and b:c = 8:10, then a:b:c = ?

A. 4:9:10

B. 4:8:10

C. 8:16:20

D. 3:8:11

Answer: Option B

Solution (By JKSSB Mock Tests)

Combine ratios: a:b = 4:8, b:c = 8:10 ⇒ a:b:c = 4:8:10.

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 7:5. After 11 years, the ratio becomes 8:7. Present age of A is?

A. 210 years

B. 105 years

C. 102 years

D. 110 years

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Correct Answer: Option B

Explanation:
Let ages 7k and 5k. Then (7k + 11)/(5k + 11) = 8/7. Solving gives k ≈ 15, age of A = 7*15 = 105.

This question belongs to: Maths Ratio and Proportion

Question #2

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Find the mean proportional between 10 and 72.

A. 82

B. 29

C. 52

D. 26

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Correct Answer: Option D

Explanation:
Mean proportional = √(10 × 72) = √(720) = 26.

This question belongs to: Maths Ratio and Proportion

Question #3

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

A. 83 years

B. 180 years

C. 90 years

D. 95 years

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Correct Answer: Option C

Explanation:
Let ages 6k and 4k. Then (6k + 9)/(4k + 9) = 9/6. Solving gives k ≈ 15, age of A = 6*15 = 90.

This question belongs to: Maths Ratio and Proportion

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