Problema Solution
The length of a rectangle is 5 centimeters less than twice its width. The perimeter of the rectangle is 80 cm. What are the dimensions of the rectangle?
Answer provided by our tutors
Let's start by naming variables. Let's call the length 'L' and the width 'W'.
Then the first sentence tell us that:
L = 2W - 5
Remember that the perimeter of a rectangle is P = 2L + 2W.
So the second sentence tells us:
2L + 2W = 80
Now we need to solve the system of equations:
L = 2W - 5
2L + 2W = 80
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click here to see the system of equations solved for L and W
........
L = 25 cm
W = 15 cm
So the dimensions of the rectangle are 25 cm by 15 cm.