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Question

The perimeter of a rectangular piece of paper is 56 cm. If the length is three times its width, find its width.


A

8 cm

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B

56 cm

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C

7 cm

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D

21 cm

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Solution

The correct option is C

7 cm


Given, perimeter of the rectangular piece of paper = 56 cm

Length = 3 × width (given)
Let the width be x.
Length =3x
Perimeter = 2 (length + width)
=2 (3x + x)= 8x cm

8x = 56 (since perimeter = 56 cm)
x = 7 cm

Width of the rectangle is 7 cm.


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