Question

if X^2- Y^2= 28 and X-Y= 8 then average of X and Y is?​

Answer 1

Average of x and y will be (x + y)/2

x^2 - y^2 = 28

(x - y) (x + y) = 28

8 (x + y) = 28

x + y = 28/8 =

(x + y)/2 = 28/16

= 7/4