The length of a lacrosse field is 10 yards less than twice its width, and the perimeter is 340 yards. The defensive area of the field is 5/22 of the total field area. find the defensive area of the lacrosse field.

assume the width is x, then length is 2x-10

perimeter=2(x+2x-10)=2(3x-10)=6x-20=340, x=360/6=60

total area=x(2x-10)=60(120-10)=6600

defensive area=(5/22)*6600=1500

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