Question

What should be added to (1/2+1/3+1/5) to get 4

Answer 1

let x should be added
then 1/2+1/3+1/5+x=4
15+10+6+30x=4×30
31+30x=120
30x=89
x=89/30 ans

Answer 2

=2/5 (1/2+1/3+1/5)
=2/10+2/15+2/25
=4+6+10/5
=20/5
=4