Posted by Beth on Wednesday, January 12, 2011 at 8:56pm.
well if you cut off 1/5 of 1/2, you removed 1/10, and you have 4/5 of 1/2 left, or 4/10 left.
If 4/10 is 8 feet, then
4/10 of Original=8
multiply both sides by 10/4
Original=80/4=20 feet
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