Question

The average of x,y,z and 40 is 10.what is the average of x,y,z?

Answer 1

`0`

Explanation:

`(x+y+z+40)/ 4 = 10`

`x+y+z+40=4xx10 = 40`

`x+y+z=40-40`

`x+y+z=0`