ArandomMexican8481 ArandomMexican8481

25-03-2018
Mathematics

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The length of a rectangle is twice its width. if the width is decreased by 5, the new rectangle has a perimeter of 86. what is the length of the new rectangle?

Respuesta :

ava20can ava20can

29-03-2018

lest assume Length=y and Width=x
y=2x

p=2(x+y)
86=2(x+2x)
86/2= 3x

Now we know that x has been decreased by 5
therefore we replace x by x-5

43=3(x-5)
43=3x-15
58=3x
x=19.3

if the width is 19.3
the length is 38.6

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