The average (arithmetic mean) of x and y is 20. If z = 5, what is the average of x, y, and z.

A 15

B 12.5

C 10

D 25/3

Solution

Correct Answer: Option A

এখানে , (x + y )/2=20
বা, x + y =40
∴(x + y + z )/3= (40 + 5 )/3= 45/3=15