The average of x and y is 40 and that of y and z is What is the value of x-z?

The average of x and y is 40 and that of y and z is What is the value of x-z?

A 5

B 30

C 20

D 25

Solution

Correct Answer: Option E

(x+y)/2 =40

or,x+y =80.....(1)

(y+z)/2 =35

or,y+z=70

or,y =70-z

by putting the value of y.we get,

x+70-z=80

or,x-z=10