Question

An electrician bought 80 feet of electrical wire and used 55 feet of it. What percent of the wire went unused?

Answer 1

Since 55 feet were used, then 80 - 55 = 25 feet was unused. To find the percentage, we take a fraction of the part over the whole

$\frac{25}{80} = 31.25%$

So 31.25% of the wire is unused.