Question

The sum of the length (denote by z) and the girth (perimeter of a cross section) of packages carried by a delivery service cannot exceed 72 inches. Find the dimensions of the rectangular package of largest volume that may be sent.
A) x = 9, y = 9, z = 24
B) x = 6, y = 6, z = 48
C) x = 12 , y = 12 , z = 24
D) x = 4.8, y = 7.2, z = 48
E) x = 2.4, y = 14.4, z = 38.4

Answer

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