Question

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?

Answer 1

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