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 = <<40/5=8>>8 tightening bolts.
If for every 1 bolt he uses two washers, then he will need 8 * 2 = <<8*2=16>>16 washers to complete the job.
if he buys a bag containing 20 washers, and removes 16, he will have 20 - 16 = <<20-16=4>>4 washers remaining in the bag.
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