Question 576912
The length of a rectangle is 3cm less than twice the width.
 The perimeter of the rectangle is 72cm.
 Find the length and width of the rectangle. 
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The perimeter
2L + 2W = 72
:
It say's,"The length of a rectangle is 3cm less than twice the width.". therefore:
L = 2W - 3
:
Replace L in the 1st equation with (2W-3)
2(2W-3) + 2W = 72
Mult what's inside the brackets
4W - 6 + 2W = 72
4W + 2W = 72 + 6
6W = 78
W = {{{78/6}}}
W = 13
:
Now you should be able to find L. Then check the perimeter with those values