SOLUTION: darren used pieces of moulding 7 1/2 feet long, 2 3/4 feet long and 7 1/2 feet long to frame a doorway. If he started with 20 feet of moulding, how much was left over?

Question 100986: darren used pieces of moulding 7 1/2 feet long, 2 3/4 feet long and 7 1/2 feet long to frame a doorway. If he started with 20 feet of moulding, how much was left over?
Answer by doukungfoo(195) (Show Source): You can put this solution on YOUR website!
First add all the pieces together to find the total length Darren
used when framing the doorway.
7 1/2 + 7 1/2 + 2 3/4
15 + 2 3/4
17 3/4 feet
Now if Darren started with 20 feet of moulding. We can find out how
much is left over by subtraction.
20 - 17 3/4
2 1/4 feet
Answer: So there is 2 1/4 feet of moulding left over.

Side note: It may be interesting to note that in real world application the left over amount would be slightly shorter than 2 1/4 feet. This is because if you were to actually take a saw and cut a piece of moulding a small part of the moulding equal to the width of the blade will be lost. Essientially turned into saw dust.
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