The area of a rectangular field is equal to 800 square meters. Its perimeter is equal to 120 meters. Find the width of this rectangle.	Choose the correct choice from the following choices:
A) 5
B) 10
C) 15
D) 20
E) 25
L * W = 800 : area , L is the length and W is the width.   2 L + 2 W = 120 : perimeter   L = 60 - w : solve for L   (60 - W) * W = 800 : substitute in the area equation   W = 20 and L = 40   correct answer 20
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The area of a rectangular field is equal to 800 square meters. Its perimeter is equal to 120 meters. Find the width of this rectangle.