Question

the sum of present ages of the father and the son is 85 years . 20 years ago the age of the father was 8 time the age of the son . find the present age of each

Answer 1

let age of father=x
let age of his son=y
A. T.Q
x+y=85
x=85-y
20 years ago
present age of father = x-20
present age of his son=y-20
A.T.Q
x-20=8(y-20)
x-20=8y-160
x-8y=-160+20
x-8y=-140
85-y-8y=-140
-9y=-140-85
-9y=-225
y=25
x=85-25
x=60
age of father =x=60years
age of his son=Y=25