An electrician bought 80 feet of electrical wire and used 65 feet of it. What percent of the wire went unused?
Seventy percent of a roof, or 1400 square feet of the roof, has been re-shingled. What is the total area of the roof?
Unused percentage =15/80 *100 =1500/80 = 150/8 = 75/4 = 18.75%
Reshingled = 1400 sq feet = 70%
100% = 1400/0.7 = 2000 sq feet
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