Find the mean proportional between 19 and 77. MCQ with Answer and Explanation

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Find the mean proportional between 19 and 77.

A. 41

B. 38

C. 76

D. 96

Answer: Option B

Solution (By JKSSB Mock Tests)

Mean proportional = √(19 × 77) = √(1463) = 38.

This question belongs to: Maths Ratio and Proportion

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Question #1

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Milk and water are in ratio 4:3 in a 255 L mixture. Quantity of milk?

A. 290 L

B. 191 L

C. 145 L

D. 110 L

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Correct Answer: Option C

Explanation:
Total parts = 7. Milk = [4 / (4+3)] × 255 = 145 L.

This question belongs to: Maths Ratio and Proportion

Question #2

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Two numbers are in ratio 9:5. Their difference is 112. What is their sum?

A. 420

B. 569

C. 210

D. 448

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Correct Answer: Option A

Explanation:
Numbers 9k, 5k. Difference |9-5|k = 112 ⇒ k = 28. Sum = (9+5)k ≈ 420.

This question belongs to: Maths Ratio and Proportion

Question #3

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If a:b = 2:7 and b:c = 7:12, then a:b:c = ?

A. 2:7:12

B. 4:14:24

C. 1:7:13

D. 2:8:12

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Correct Answer: Option A

Explanation:
Combine ratios: a:b = 2:7, b:c = 7:12 ⇒ a:b:c = 2:7:12.

This question belongs to: Maths Ratio and Proportion

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