Question

Marichi is 20 years older than Kristel. Seven years from now, Marichu will be thrice as old as Kristel. Find their present age?

Answer 1

Let x and y be the present ages of marichi and kristel respectively

A/c to the q.

y+20=x

(x+7)=3(y+7)

or,x+7=3y+21

or, y+20=3y+21-7(x=y+20)

or,20-14=3y-y

or,6=2y

y=3 years

So, x=23 years