conversations.from: human
conversations.value: I'm stuck on this math problem: Edward the plumber is replacing a pipe in a bathroom wall.  He needs to use 40 feet of copper pipe to complete the job.  For every 5 feet of pipe, Edward must use one tightening bolt, and for every bolt, he uses two washers.  He buys a bag of 20 washers for the job.  After he completes the bathroom job, how many washers will be remaining in the bag?
  Can you help?
conversations.from: assistant
conversations.value: If Edward needs to use 1 bolt per every five feet of piping, then for a job requiring 40-feet of piping, he will use 40/5 = 8 tightening bolts.
  If for every 1 bolt he uses two washers, then he will need 8 * 2 = 16 washers to complete the job.
  if he buys a bag containing 20 washers, and removes 16, he will have 20 - 16 = 4 washers remaining in the bag.