If average of 8 and 12 is 10 and average of 12 and x is 15, x is MCQ with Answer and Explanation

If average of 8 and 12 is 10 and average of 12 and x is 15, x is

A. 20

B. 15

C. 16

D. 18

Answer: Option D

12 + x =30. x=18.

This question belongs to: Maths Average

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Question #1 Report Error

What is the average of the first 9 odd numbers?

A. 9

B. 9.5

C. 10

D. 8.5

Correct Answer: Option A

Explanation:
Sum of first n odd numbers = n^2 =9^2=81. Average=81/9=9.

This question belongs to: Maths Average

Question #2 Report Error

Average of 8 numbers 1000. If average of 5 is 995, average of remaining 3?

A. 1010

B. 1007

C. 1005

D. 1008.33

Correct Answer: Option D

Explanation:
Sum8=8000. Sum5=4975. Remaining=3025. Average≈1008.33.

This question belongs to: Maths Average

Question #3 Report Error

Average of 9,18,27,36,45,54 is

A. 30

B. 33

C. 32

D. 31.5

Correct Answer: Option D

Explanation:
189/6=31.5.

This question belongs to: Maths Average