If a:b = 7:5 and b:c = 5:5, then a:b:c = ? MCQ with Answer and Explanation

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If a:b = 7:5 and b:c = 5:5, then a:b:c = ?

A. 6:5:6

B. 14:10:10

C. 7:5:5

D. 7:6:5

Answer: Option C

Solution (By JKSSB Mock Tests)

Combine ratios: a:b = 7:5, b:c = 5:5 ⇒ a:b:c = 7:5:5.

This question belongs to: Maths Ratio and Proportion

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Question #1

If a:b = 2:5 and b:c = 5:10, then a:b:c = ?

A. 2:6:10

B. 1:5:11

C. 4:10:20

D. 2:5:10

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Correct Answer: Option D

Explanation:
Combine ratios: a:b = 2:5, b:c = 5:10 ⇒ a:b:c = 2:5:10.

This question belongs to: Maths Ratio and Proportion

Question #2

Find the mean proportional between 4 and 21.

A. 25

B. 12

C. 18

D. 9

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Correct Answer: Option D

Explanation:
Mean proportional = √(4 × 21) = √(84) = 9.

This question belongs to: Maths Ratio and Proportion

Question #3

Two numbers are in the ratio 4:8 and their sum is 512. Find the numbers.

A. 162 and 351

B. 178 and 309

C. 336 and 672

D. 168 and 336

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Correct Answer: Option D

Explanation:
Numbers = 4k and 8k. 4k + 8k = 512 ⇒ k = 42. Thus, numbers are 168 and 336.

This question belongs to: Maths Ratio and Proportion

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