Question

If father's age is 4 times his son's age.After 6 years father's age is 2.5 times and 6 years more of its son's age.find the present age of father and son.

Answer 1

let sons age y
father=4y
after 6 year fathers age=2.5(y+6)+6=2.5y+15+6=2.5y+21
now
2.5y+21-4y=6
-1.5y=-15
y=10
father=4×10=40

Answer 2

you should make linear equations of this sum then you will find