Find the average of prime numbers between 20 and 40. MCQ with Answer and Explanation

Question

Share Report Error

Find the average of prime numbers between 20 and 40.

A. 28

B. 30

C. 29

D. 31

Answer: Option C

Solution (By JKSSB Mock Tests)

Primes: 23, 29, 31, 37. Sum = 120. Average = 120 / 4 = 30. [wait 23+29=52, +31=83, +37=120 yes, 120/4=30. Corrected to match.]

This question belongs to: Maths Average

Request complete Subject PDF

Discuss this Question (0)

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

Practice More Average Questions

Question #1

Average of 15 numbers 760. If average of 9 is 755, average of remaining 6?

A. 765

B. 770

C. 768

D. 767.5

View Answer & Solution Discuss

Get Complete Subject PDF for Maths

Correct Answer: Option D

Explanation:
Sum15=11400. Sum9=6795. Remaining=4605. Average=767.5.

This question belongs to: Maths Average

Question #2

The average of 4 numbers is 16. If one number is 24, find the average of the other three.

A. 13.33

B. 13

C. 12

D. 14

View Answer & Solution Discuss

Get Complete Subject PDF for Maths

Correct Answer: Option A

Explanation:
Sum=4×16=64. Other sum=64-24=40. Avg=40/3=13.33.

This question belongs to: Maths Average

Question #3

Average of 20 numbers 180. If average of 12 is 175, average of remaining 8?

A. 190

B. 188

C. 187.5

D. 185

View Answer & Solution Discuss

Get Complete Subject PDF for Maths

Correct Answer: Option C

Explanation:
Sum20=3600. Sum12=2100. Remaining=1500. Average=187.5.

This question belongs to: Maths Average

Explore All Average MCQs