A group of 5 friends average age 25. If one leaves, average becomes 24. Age of person who left? MCQ with Answer and Explanation

A group of 5 friends average age 25. If one leaves, average becomes 24. Age of person who left?

A. 31

B. 28

C. 30

D. 29

Answer: Option D

Sum5=125. Sum4=96. Left=29.

This question belongs to: Maths Average

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Question #1 Report Error

The average of all natural numbers from 1 to 40 is

A. 19.5

B. 20.5

C. 20

D. 21

Correct Answer: Option B

Explanation:
(40+1)/2=20.5.

This question belongs to: Maths Average

Question #2 Report Error

In a class of 40 students, average marks in Maths is 65. If average of 10 students is 80, what is average of remaining?

A. 58

B. 60

C. 55

D. 62

Correct Answer: Option B

Explanation:
Total marks = 40×65=2600. Marks of 10=10×80=800. Remaining marks=1800. Average=1800/30=60.

This question belongs to: Maths Average

Question #3 Report Error

Average of 15 numbers 1010. If average of 9 is 1005, average of remaining 6?

A. 1017.5

B. 1018

C. 1015

D. 1020

Correct Answer: Option A

Explanation:
Sum15=15150. Sum9=9045. Remaining=6105. Average=1017.5.

This question belongs to: Maths Average