Dj spent $227.40 on plumbing supplies. he bought pipe that cost $6.75 per foot and a wrench set that costs $45.15. how many feet of pipe did dj buy?

To find the cost of the pipe you take $45.15 away from $227.40. This gives you $182.25. Let x equal the number of feet of pipe bought and form an equation using x:
6.75x=182.25
x=182.25/6.75
x=27 feet