Let w= width then Length= 3w-5
Perimeter = 2(w) +2(3w-5) =374
374 = 2w + 6w -10
384 = 8w
w= 48
l = 3(48) -5 = 139
width =48 and length=139
Jon S.
asked 04/15/19Let w= width then Length= 3w-5
Perimeter = 2(w) +2(3w-5) =374
374 = 2w + 6w -10
384 = 8w
w= 48
l = 3(48) -5 = 139
width =48 and length=139
Chris T. answered 04/15/19
SAT & GRE Tutor, ready to demystify the tests for you
This is a question that tests our understanding of perimeter formula and ability to draw equations out of this word problem. We know the perimeter is the sum of all the sides, length+length+width+width, or 2*length+2*width, and in this case that is 374. We also know that the length of this rectangle is 5 less than 3 times the width. So length = 3 * width - 5. Now we have two equations and two variables:
2l+2w=374
l=3w-5
With 2 equations and 2 variables, we can solve by substituting 3w-5 in for l in the first equation to get:
2(3w-5)+2w=374
6w-10+2w=374
8w=384
w=48
width = 48, and so length would be 3*48-5=139. Doublechecking, 48+48+139+139=374, so our rectangular playing field is 48x139
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