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

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

A. 2:3:11

B. 3:3:10

C. 6:6:20

D. 3:4:10

Answer: Option B

Solution (By JKSSB Mock Tests)

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

This question belongs to: Maths Ratio and Proportion

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Question #1

If a:b = 4:5 and b:c = 5:6, then a:b:c = ?

A. 3:5:7

B. 4:6:6

C. 4:5:6

D. 8:10:12

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Correct Answer: Option C

Explanation:
Combine ratios: a:b = 4:5, b:c = 5:6 ⇒ a:b:c = 4:5:6.

This question belongs to: Maths Ratio and Proportion

Question #2

If a:b = 7:3 and b:c = 3:8, then a:b:c = ?

A. 6:3:9

B. 7:3:8

C. 7:4:8

D. 14:6:16

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Correct Answer: Option B

Explanation:
Combine ratios: a:b = 7:3, b:c = 3:8 ⇒ a:b:c = 7:3:8.

This question belongs to: Maths Ratio and Proportion

Question #3

Ratio of present ages of A and B is 4:6. After 9 years, the ratio becomes 7:8. Present age of A is?

A. 93 years

B. 88 years

C. 83 years

D. 176 years

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Correct Answer: Option B

Explanation:
Let ages 4k and 6k. Then (4k + 9)/(6k + 9) = 7/8. Solving gives k ≈ 22, age of A = 4*22 = 88.

This question belongs to: Maths Ratio and Proportion

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