The perimeter of a rectangular poster is 108 in. The length is 12 in. greater than the width. Find the length.

The perimeter of a rectangular poster is 108 in. The length is 12 in. greater than the width. Find the length.

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Perimeter is twice the sum of length and width, so length+width=54in.

Length+width=width+12+width=54, twice the width=54-12=42in, so width=21in and length=21+12=33in.

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