Find the mean proportional between 29 and 50. MCQ with Answer and Explanation

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Find the mean proportional between 29 and 50.

A. 76

B. 79

C. 38

D. 41

Answer: Option C

Solution (By JKSSB Mock Tests)

Mean proportional = √(29 × 50) = √(1450) = 38.

This question belongs to: Maths Ratio and Proportion

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Question #1

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Ratio of present ages of A and B is 7:6. After 11 years, the ratio becomes 9:9. Present age of A is?

A. 196 years

B. 98 years

C. 95 years

D. 103 years

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Correct Answer: Option B

Explanation:
Let ages 7k and 6k. Then (7k + 11)/(6k + 11) = 9/9. Solving gives k ≈ 14, age of A = 7*14 = 98.

This question belongs to: Maths Ratio and Proportion

Question #2

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Two numbers are in ratio 7:4. Their difference is 53. What is their sum?

A. 418

B. 209

C. 547

D. 471

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Correct Answer: Option A

Explanation:
Numbers 7k, 4k. Difference |7-4|k = 53 ⇒ k = 17. Sum = (7+4)k ≈ 418.

This question belongs to: Maths Ratio and Proportion

Question #3

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Two numbers are in ratio 8:11. Their difference is 86. What is their sum?

A. 344

B. 304

C. 152

D. 427

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Correct Answer: Option B

Explanation:
Numbers 8k, 11k. Difference |8-11|k = 86 ⇒ k = 28. Sum = (8+11)k ≈ 304.

This question belongs to: Maths Ratio and Proportion

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