Average of 10,20,30,40 is MCQ with Answer and Explanation

Average of 10,20,30,40 is

A. 20

B. 25

C. 22.5

D. 30

Answer: Option B

100/4=25.

This question belongs to: Maths Average

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Question #1 Report Error

Average of 9 numbers 2190. If average of 6 is 2185, average of remaining 3?

A. 2195

B. 2205

C. 2198

D. 2200

Correct Answer: Option D

Explanation:
Sum9=19710. Sum6=13110. Remaining=6600. Average=2200.

This question belongs to: Maths Average

Question #2 Report Error

A library has average 120 books per shelf for 10 shelves. If one shelf has 150, what is average of remaining?

A. 118

B. 116.67

C. 120

D. 115

Correct Answer: Option B

Explanation:
Total=1200. Remaining=1050 for 9. 1050/9≈116.67.

This question belongs to: Maths Average

Question #3 Report Error

The average of 6 numbers is 18. If one number is 30, find the average of the remaining 5.

A. 16

B. 16.8

C. 15.6

D. 14.4

Correct Answer: Option C

Explanation:
Sum=6×18=108. Remaining sum=108-30=78. Avg=78/5=15.6.

This question belongs to: Maths Average