Harriet wants to put up fencing around three sides of her rectangular yard and leave a side of 20 feet unfenced. If the

Harriet wants to put up fencing around three sides of her rectangular yard and leave a side of 20 feet unfenced. If the yard has an area of 680 square feet, how many feet of fencing does she need?

A) 34
B) 40
C) 68
D) 88
E) 102

Answer: D
Source: Official guide

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