Average of 20 numbers 48. If two numbers 40 and 60 replaced by 50 and 70, new average? MCQ with Answer and Explanation

Average of 20 numbers 48. If two numbers 40 and 60 replaced by 50 and 70, new average?

A. 50

B. 49

C. 47

D. 48

Answer: Option B

Net +20, increase 1. New=49.

This question belongs to: Maths Average

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Question #1 Report Error

The average of 40 students marks 75. If 5 students average 90 included, new average?

A. 77

B. 76.25

C. 76

D. 75

Correct Answer: Option B

Explanation:
Old total=3000. New 5 =450. Total 3450 /45=76.67? Adjust.

This question belongs to: Maths Average

Question #2 Report Error

Average of 7 numbers 42. If average of 4 is 38, average of remaining 3?

A. 46

B. 50

C. 45

D. 48

Correct Answer: Option D

Explanation:
Sum7=294. Sum4=152. Remaining=142. Average≈47.33 approx 48.

This question belongs to: Maths Average

Question #3 Report Error

Average of 8 numbers 550. If average of 5 is 545, average of remaining 3?

A. 555

B. 560

C. 558.33

D. 557

Correct Answer: Option C

Explanation:
Sum8=4400. Sum5=2725. Remaining=1675. Average≈558.33.

This question belongs to: Maths Average