Question 565278
let first number be x
second number be y

x+y = 2x-15
x-y = 2y-5


x+y = 2x-15
-2x
x-2x+y=2x-2x-5
y-x=-15.....................(1)
x-y = 2y-5
-2y
x-y-2y=2y-2y-5
x-3y=-5....................(2)

add equation (1) & (2)
y-3y=-15-5
-2y=-20
/-2
y=10
plug y in (1)
10-x=-15
-x=-10-15
-x=-25
/-1
x=25