Question

A mother is 20years older than her son.Ten years ago she was 3times as old as her son was,then.find their present ages

Answer 1

A mother is 20 years older than her son. Ten years ago she was 3 times as old as her son then. Find their present ages.
***
let x=son's age
x+20=mother's age
..
10 yrs ago:
x-10=son's age
x+20-10=x+10=mother's age
x+10=3(x-10)
x+10=3x-30
2x=40
x=20
x+20=40
son's age=20
mother's age=40

Answer 2

let x=son's age
x+20=mother's age
..
10 yrs ago:
x-10=son's age
x+20-10=x+10=mother's age
x+10=3(x-10)
x+10=3x-30
2x=40
x=20
x+20=40
son's age=20
mother's age=40

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