If average of 15 numbers is 40 and one number 50 is replaced by 30, new average? MCQ with Answer and Explanation

If average of 15 numbers is 40 and one number 50 is replaced by 30, new average?

A. 38

B. 40

C. 39

D. 41

Answer: Option C

Change -20, decrease 20/15≈1.33, new≈38.67 approx but use exact.

This question belongs to: Maths Average

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Question #1 Report Error

The average age of 4 boys is 16 years. If their ages are in ratio 1:2:3:4, what is the age of the oldest boy?

A. 25.6 years

B. 26

C. 28

D. 24

Correct Answer: Option A

Explanation:
Sum =4×16=64. Ratio sum=10. Oldest = (4/10)×64 =25.6.

This question belongs to: Maths Average

Question #2 Report Error

Average of 15 numbers 2010. If average of 9 is 2005, average of remaining 6?

A. 2015

B. 2020

C. 2017.5

D. 2018

Correct Answer: Option C

Explanation:
Sum15=30150. Sum9=18045. Remaining=12105. Average=2017.5.

This question belongs to: Maths Average

Question #3 Report Error

The average of 588,784 is

A. 686

B. 690

C. 680

D. 670

Correct Answer: Option A

Explanation:
686.

This question belongs to: Maths Average