SOLUTION: The width of a rectangle is fixed at 15cm. What lengths will make the permiter greater than 72 cm

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Question 187716: The width of a rectangle is fixed at 15cm. What lengths will make the permiter greater than 72 cm
Answer by nerdybill(7384) About Me  (Show Source):
You can put this solution on YOUR website!
Let x = length
width is given as 15 cm
.
Perimeter = 2(width + length)
.
72 < 2(15+x)
dividing both sides by 2:
36 < 15+x
subtracting both sides by 15:
21 < x
.
This says that the length has to be "greater than" 21 cm.