Find the mean proportional between 24 and 76. MCQ with Answer and Explanation

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Find the mean proportional between 24 and 76.

A. 84

B. 100

C. 45

D. 42

Answer: Option D

Solution (By JKSSB Mock Tests)

Mean proportional = √(24 × 76) = √(1824) = 42.

This question belongs to: Maths Ratio and Proportion

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Question #1

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Milk and water are in ratio 3:5 in a 587 L mixture. Quantity of milk?

A. 367 L

B. 248 L

C. 220 L

D. 440 L

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Correct Answer: Option C

Explanation:
Total parts = 8. Milk = [3 / (3+5)] × 587 = 220 L.

This question belongs to: Maths Ratio and Proportion

Question #2

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If a:b = 7:4 and b:c = 4:4, then a:b:c = ?

A. 7:4:4

B. 6:4:5

C. 14:8:8

D. 7:5:4

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Correct Answer: Option A

Explanation:
Combine ratios: a:b = 7:4, b:c = 4:4 ⇒ a:b:c = 7:4:4.

This question belongs to: Maths Ratio and Proportion

Question #3

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Ratio of present ages of A and B is 4:4. After 6 years, the ratio becomes 5:5. Present age of A is?

A. 89 years

B. 84 years

C. 168 years

D. 81 years

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Correct Answer: Option B

Explanation:
Let ages 4k and 4k. Then (4k + 6)/(4k + 6) = 5/5. Solving gives k ≈ 21, age of A = 4*21 = 84.

This question belongs to: Maths Ratio and Proportion

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