If average of a,b,c is 25, b=20, average of a,c? MCQ with Answer and Explanation

If average of a,b,c is 25, b=20, average of a,c?

A. 30

B. 27.5

C. 25

D. 22.5

Answer: Option B

a+c=75-20=55. Average=27.5.

This question belongs to: Maths Average

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Question #1 Report Error

Average of 9 numbers 1840. If average of 6 is 1835, average of remaining 3?

A. 1855

B. 1845

C. 1848

D. 1850

Correct Answer: Option D

Explanation:
Sum9=16560. Sum6=11010. Remaining=5550. Average=1850.

This question belongs to: Maths Average

Question #2 Report Error

If average of 12 numbers is 35 and average of first 8 is 32, average of last 4?

A. 42

B. 38

C. 41

D. 40

Correct Answer: Option C

Explanation:
Sum12=420. Sum8=256. Last4=164. Average=41.

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. 46.35

B. 45.35

C. 46

D. 47

Correct Answer: Option A

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