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The length of a rectangular deck is 4 times its width. If the deck's perimeter is 30 feet, what is the deck's area?
36 square feet because the width would be a and so since the length is 4 times that you can say that the two sides added together would be 5a 30 feet is the parameter which would include all 4 sides but we are only looking for 2 sides so you can divide that by 2 so 5a=15 so divide 15 by 5 and you get 3 so a=3 4a=4*3= 12=length a=3=width length*width=area 12*3= 36 square feet
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