If average of 20 numbers is 30 and 10 numbers average 25, average of remaining 10? MCQ with Answer and Explanation

If average of 20 numbers is 30 and 10 numbers average 25, average of remaining 10?

A. 32.5

B. 35

C. 40

D. 30

Answer: Option B

Sum20=600. Sum10=250. Remaining=350. Average=35.

This question belongs to: Maths Average

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Question #1 Report Error

The average marks of 12 students is 72. If a student with 88 marks leaves, what is the new average?

A. 70

B. 70.55

C. 71

D. 71.5

Correct Answer: Option B

Explanation:
Sum=12×72=864. New sum=864-88=776. New avg=776/11=70.545≈70.55.

This question belongs to: Maths Average

Question #2 Report Error

What is average of all two digit numbers?

A. 50

B. 45

C. 54.5

D. 55

Correct Answer: Option C

Explanation:
From 10 to 99, 90 numbers. Average (10+99)/2=54.5.

This question belongs to: Maths Average

Question #3 Report Error

Average of 345,460,575 is

A. 450

B. 470

C. 460

D. 455

Correct Answer: Option C

Explanation:
1380/3=460.

This question belongs to: Maths Average