If a:b = 2:8 and b:c = 8:4, then a:b:c = ? MCQ with Answer and Explanation

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If a:b = 2:8 and b:c = 8:4, then a:b:c = ?

A. 1:8:5

B. 2:8:4

C. 2:9:4

D. 4:16:8

Answer: Option B

Solution (By JKSSB Mock Tests)

Combine ratios: a:b = 2:8, b:c = 8:4 ⇒ a:b:c = 2:8:4.

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 7:8. After 10 years, the ratio becomes 9:10. Present age of A is?

A. 152 years

B. 143 years

C. 147 years

D. 294 years

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Correct Answer: Option C

Explanation:
Let ages 7k and 8k. Then (7k + 10)/(8k + 10) = 9/10. Solving gives k ≈ 21, age of A = 7*21 = 147.

This question belongs to: Maths Ratio and Proportion

Question #2

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Two numbers are in ratio 10:6. Their difference is 122. What is their sum?

A. 544

B. 582

C. 630

D. 272

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Correct Answer: Option A

Explanation:
Numbers 10k, 6k. Difference |10-6|k = 122 ⇒ k = 30. Sum = (10+6)k ≈ 544.

This question belongs to: Maths Ratio and Proportion

Question #3

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If a:b = 5:8 and b:c = 8:6, then a:b:c = ?

A. 10:16:12

B. 5:9:6

C. 5:8:6

D. 4:8:7

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Correct Answer: Option C

Explanation:
Combine ratios: a:b = 5:8, b:c = 8:6 ⇒ a:b:c = 5:8:6.

This question belongs to: Maths Ratio and Proportion

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