The perimeter of a rectangle is 42cm and it’s length xcm. Find its width in terms of x

Answer 1

Let the length of the rectangle be x cm and the width be y cm.

Perimeter of a rectangle = 2(length + width)
42 = 2(x + y)
42 = 2x + 2y
Dividing by 2:
21 = x + y
y = 21 - x

Therefore, the width of the rectangle in terms of x is 21 - x cm.