If a:b = 7:6 and b:c = 6:7, then a:b:c = ? MCQ with Answer and Explanation

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If a:b = 7:6 and b:c = 6:7, then a:b:c = ?

A. 7:6:7

B. 7:7:7

C. 14:12:14

D. 6:6:8

Answer: Option A

Solution (By JKSSB Mock Tests)

Combine ratios: a:b = 7:6, b:c = 6:7 ⇒ a:b:c = 7:6:7.

This question belongs to: Maths Ratio and Proportion

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Practice More Ratio and Proportion Questions

Question #1

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

A. 8:5:4

B. 7:4:5

C. 8:4:4

D. 16:8:8

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Correct Answer: Option C

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

This question belongs to: Maths Ratio and Proportion

Question #2

Ratio of present ages of A and B is 6:5. After 5 years, the ratio becomes 7:6. Present age of A is?

A. 59 years

B. 48 years

C. 54 years

D. 108 years

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Correct Answer: Option C

Explanation:
Let ages 6k and 5k. Then (6k + 5)/(5k + 5) = 7/6. Solving gives k ≈ 9, age of A = 6*9 = 54.

This question belongs to: Maths Ratio and Proportion

Question #3

Find the mean proportional between 36 and 21.

A. 57

B. 54

C. 27

D. 30

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Correct Answer: Option C

Explanation:
Mean proportional = √(36 × 21) = √(756) = 27.

This question belongs to: Maths Ratio and Proportion

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