Question 445332
that's because it is wrong.

1/9+1/6= 6/54+9/54=15/54=5/18 not 1/15
how on earth did you get an answer of three from 
1/9+1/6=1/15 there is no variable?
You just through a bunch of numbers on your paper.


Together they do one -1- job
x is the number of hours they work
x/9+x/6=1
multiply by 18
2x+3x=18
5x=18
x=18/5 =3 3/5 hrs