@Airaasayss x+y=60...Eqn(1)
x-y=40...Eqn(2)
x/y=?...Eqn(3)
Using Eqn(1)
Make x the subject of formula
x=60-y
Substitute x=60-y in eqn(2)
60-y-y=40
60-2y=40
-2y=40-60
-2y=-20
y=-20/-2
y=10
Substitute (y=10) in eqn(1) to find x
x+10=60
x=60-10
x=50
Substitute x and y in eqn(3)
50/10=5