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A rectangular lot whose perimeter is 260 feet is fenced along three sides.

A rectangular lot whose perimeter is 260 feet is fenced
along three sides. An expensive fencing along the lot’s
length costs $16 per foot, and an inexpensive fencing along
the two side widths costs only $5 per foot. The total cost of
the fencing along the three sides comes to $1780.What are
the lot’s dimensions?

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