Question

One number is 3 times another number if 15 is added to both number. then one new number becomes twice that of other number

Answer 1

let the no. be x

15+x=3x+15

2(15+x)=2(3x+15)

30+x=6x+30

30-30=6x-x

0=5x

0/5=x

0=x

x=0