Question

Banu is 20 years older than binuin 5 year banu will be twice as old as binu .find their present ages

Answer 1

Let Banu be x.
Let Binu be y.
x=20+y

x+5 =2(y+5)
20+y+5=2y+10
20+y-2y=10-5
-y=5-20
-y=-15
y=15

x=20+y
=20+15
=35
Present age are 35 and 15