Ms. Lyla wants to put up fencing around three sides of her rectangular garden and have a side of 20 meter unfenced. If the yard has an area of 680 square meters, how many yards of fencing does she need ?

Correct Answer: 88
Length of the garden = 680/20 = 34 meter Total length of the three sides = 2×34 + 20 = 68 + 20 =  88 meter