If a:b = 7:10 and b:c = 10:9, then a:b:c = ? MCQ with Answer and Explanation

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If a:b = 7:10 and b:c = 10:9, then a:b:c = ?

A. 7:10:9

B. 7:11:9

C. 6:10:10

D. 14:20:18

Answer: Option A

Solution (By JKSSB Mock Tests)

Combine ratios: a:b = 7:10, b:c = 10:9 ⇒ a:b:c = 7:10:9.

This question belongs to: Maths Ratio and Proportion

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Practice More Ratio and Proportion Questions

Question #1

Find the mean proportional between 14 and 77.

A. 32

B. 64

C. 35

D. 91

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Correct Answer: Option A

Explanation:
Mean proportional = √(14 × 77) = √(1078) = 32.

This question belongs to: Maths Ratio and Proportion

Question #2

Find the mean proportional between 11 and 61.

A. 28

B. 72

C. 25

D. 50

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Correct Answer: Option C

Explanation:
Mean proportional = √(11 × 61) = √(671) = 25.

This question belongs to: Maths Ratio and Proportion

Question #3

Two numbers are in the ratio 7:4 and their sum is 257. Find the numbers.

A. 143 and 110

B. 161 and 92

C. 322 and 184

D. 176 and 65

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Correct Answer: Option B

Explanation:
Numbers = 7k and 4k. 7k + 4k = 257 ⇒ k = 23. Thus, numbers are 161 and 92.

This question belongs to: Maths Ratio and Proportion

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