The management of a large store wishes to add a fenced-in storage yard of 20,000 square feet, using the building as one side of the yard. find the minimum amount of fencing that must be used to enclose the remaining 3 sides of the yard.

minimum fencing = 400

Explanation:

area = xy

20000 =xy

total fencing = x+y+y

now for minimum fencing

after solving we get

x = 200

therefore

y = 100

minimum fencing  = x +2y

                               = 200+2*100 = 400

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