Find the mean proportional between 30 and 37. MCQ with Answer and Explanation

Question

Share Report Error

Find the mean proportional between 30 and 37.

A. 36

B. 66

C. 67

D. 33

Answer: Option D

Solution (By JKSSB Mock Tests)

Mean proportional = √(30 × 37) = √(1110) = 33.

This question belongs to: Maths Ratio and Proportion

Request complete Subject PDF

Discuss this Question (0)

No comments yet. Be the first to start the discussion!

Practice More Ratio and Proportion Questions

Question #1

Share Report

Two numbers are in the ratio 13:4 and their sum is 771. Find the numbers.

A. 609 and 170

B. 585 and 180

C. 1170 and 360

D. 578 and 197

View Answer & Solution Discuss

Get Complete Subject PDF for Maths

Correct Answer: Option B

Explanation:
Numbers = 13k and 4k. 13k + 4k = 771 ⇒ k = 45. Thus, numbers are 585 and 180.

This question belongs to: Maths Ratio and Proportion

Question #2

Share Report

Ratio of present ages of A and B is 7:4. After 7 years, the ratio becomes 10:5. Present age of A is?

A. 89 years

B. 168 years

C. 78 years

D. 84 years

View Answer & Solution Discuss

Get Complete Subject PDF for Maths

Correct Answer: Option D

Explanation:
Let ages 7k and 4k. Then (7k + 7)/(4k + 7) = 10/5. Solving gives k ≈ 12, age of A = 7*12 = 84.

This question belongs to: Maths Ratio and Proportion

Question #3

Share Report

If a:b = 2:4 and b:c = 4:9, then a:b:c = ?

A. 1:4:10

B. 2:5:9

C. 2:4:9

D. 4:8:18

View Answer & Solution Discuss

Get Complete Subject PDF for Maths

Correct Answer: Option C

Explanation:
Combine ratios: a:b = 2:4, b:c = 4:9 ⇒ a:b:c = 2:4:9.

This question belongs to: Maths Ratio and Proportion

Explore All Ratio and Proportion MCQs