the length of a rectangle is 20 cm more than its breath.if the length of the rectangle is greater than 140 cm, find its minimum breath.
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l = length
b = breadth
l = b + 20 ,
l > 140
b + 20 > 140
b = 120
b = breadth
l = b + 20 ,
l > 140
b + 20 > 140
b = 120
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