The average of 10 numbers is increased by 2 when one number 15 is replaced by another. What is the new number? MCQ with Answer and Explanation

The average of 10 numbers is increased by 2 when one number 15 is replaced by another. What is the new number?

A. 40

B. 35

C. 25

D. 30

Answer: Option B

Increase in sum =10×2=20. New number =15+20=35.

This question belongs to: Maths Average

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Question #1 Report Error

A student scored 75, 80, 85 in three tests. What marks should he score in fourth test to make average 82?

A. 88

B. 85

C. 92

D. 90

Correct Answer: Option A

Explanation:
Total for 4 tests =4×82=328. Sum of three=240. Required=328-240=88.

This question belongs to: Maths Average

Question #2 Report Error

Average of 10 numbers 780. If average of 6 is 775, average of remaining 4?

A. 790

B. 786

C. 787.5

D. 785

Correct Answer: Option C

Explanation:
Sum10=7800. Sum6=4650. Remaining=3150. Average=787.5.

This question belongs to: Maths Average

Question #3 Report Error

Average of 9 numbers 1890. If average of 6 is 1885, average of remaining 3?

A. 1905

B. 1900

C. 1898

D. 1895

Correct Answer: Option B

Explanation:
Sum9=17010. Sum6=11310. Remaining=5700. Average=1900.

This question belongs to: Maths Average