If the average of z and x is 35, and the average of x and y is Then z

If the average of z and x is 35, and the average of x and y is Then z – y = ?

A 5

B 10

C 20

D 30

Correct Answer: Option C

(z + x)/2 = 35

z + x = 70 .................... (1)

And,

(x + y)/2 = 25

x + y = 50 ................. (2)

(1) - (2), we get,

z - y = 70 -50 = 20