Question

what should be added to 4/15 to make it equal to 3/5

Answer 1

let number be x
x+4/15 =3/5
x=3/5 -4/15
x=3×3 -4/15
x=9-4/15
x=5/15
x=1/3 is to be added to it

Answer 2

4/15+x=3/5
x=3/5-4/15
=(9-4)/15
=5/15=1/3