Find the dimensions of rectangle if its perimeter is 100 cm and its length is 20 cm more than its breadth.
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Let the width of the rectangle be w then the length is :
W + 20
Perimeter = 2l + 2w where
l = length
w = Width
Substituting in the formula we have :
2w + 2w + 40 = 100
4w = 100 - 40
4w = 60
w = 15
The length = 15 + 20 = 35 cm
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