The length of a rectangular field is 20 m more than its breadth. If the perimeter of the field is 280 m, what is its length? 

Let the breadth of the rectangle = x mso, length of the rectangle = x+20 mNow, perimeter = 280 m2length+breadth = 280x+20+x = 1402x = 120x = 60So, breadth = 60 mlength = 60 + 20 = 80 m

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b=a÷l
=280÷20
=140 ans
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