It is necessary to calculate the value of the width of the rectangle (we denote it by the letter W) if it is known that the perimeter of the rectangle is P = 120 cm, and the length L> W is 14 cm.
Let’s compose the equations and solve them.
1) P = 2 * (L + W).
2) L = W + 12.
Substitute the value of D from the second equation into the first and simplify.
P = 2 * (W + 12 + W).
P = 4W + 24.
W = (P – 24) / 4.
Substitute the value of P and calculate.
W = (120 – 24) / 4.
W = 96/4.
W = 24.
As a result, we have a rectangle width equal to 24 cm.
Answer: the width of the rectangle is 24 cm.
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