Find the mean proportional between 7 and 9. MCQ with Answer and Explanation

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Find the mean proportional between 7 and 9.

A. 7

B. 14

C. 16

D. 10

Answer: Option A

Solution (By JKSSB Mock Tests)

Mean proportional = √(7 × 9) = √(63) = 7.

This question belongs to: Maths Ratio and Proportion

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Question #1

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Milk and water are in ratio 8:2 in a 253 L mixture. Quantity of milk?

A. 245 L

B. 202 L

C. 51 L

D. 404 L

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Correct Answer: Option B

Explanation:
Total parts = 10. Milk = [8 / (8+2)] × 253 = 202 L.

This question belongs to: Maths Ratio and Proportion

Question #2

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Milk and water are in ratio 9:5 in a 204 L mixture. Quantity of milk?

A. 156 L

B. 131 L

C. 262 L

D. 73 L

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Correct Answer: Option B

Explanation:
Total parts = 14. Milk = [9 / (9+5)] × 204 = 131 L.

This question belongs to: Maths Ratio and Proportion

Question #3

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

A. 7:7:6

B. 7:8:6

C. 14:14:12

D. 6:7:7

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Correct Answer: Option A

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

This question belongs to: Maths Ratio and Proportion

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