Average of 50 numbers 20. If numbers are decreased by 2 each, new average? MCQ with Answer and Explanation

Average of 50 numbers 20. If numbers are decreased by 2 each, new average?

A. 22

B. 20

C. 19

D. 18

Answer: Option D

New average=20-2=18.

This question belongs to: Maths Average

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Question #1 Report Error

Average of 30 numbers 42. If average of 20 is 40, average of remaining 10?

A. 45

B. 48

C. 44

D. 46

Correct Answer: Option D

Explanation:
Total=1260. Sum20=800. Remaining=460. Average=46.

This question belongs to: Maths Average

Question #2 Report Error

Average weight of 20 girls 45 kg. If 5 boys average 55 kg included, new average for 25?

A. 46

B. 47

C. 48

D. 50

Correct Answer: Option B

Explanation:
Girls 900. Boys 275. Total 1175/25=47.

This question belongs to: Maths Average

Question #3 Report Error

The average of 20 numbers is 45. Later it was found that 52 was wrongly taken as 25. What is the correct average?

A. 46

B. 45.35

C. 47

D. 46.35

Correct Answer: Option D

Explanation:
Error = 52-25=27 too less. Correct sum = old sum +27. Old sum=20×45=900. New sum=927. Average=927/20=46.35.

This question belongs to: Maths Average