Question

A son's present age is half the present age of his mother 10 years ago the mother was thrice as old as her son what are their present ages

Answer 1

Let son's present age be x
so, his mother present age=2x

10 years ago,
son age=x-10
mother age=2x-10
ATQ (ACCORDING TO QUESTION)

2x-10=3(x-10)
2x-10=3x-30
2x-3x=-30+10
-x=-20
x=20 (minus sign will be cancelled)

so, x=20
mother present age=2*20=40years

son present age=20years

I hope it helps.....