A contractor spent $740 at a hardware store on wooden shingles and ceramic tiles. She bought the tiles for $20 per package and the shingles for $60 dollars a package. If she bought 5 more packages of tiles than shingles, how many packs of shingles did she buy?

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7.3

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answer: bearing in mind that a rectangle has a perimeter of length + length + width + width.

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p = perimeter

l = length

x=width

p = 2l + 2x

p = 2(l+x)     < ==== perimeter of the base of the box.

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for the free