the length of rectangular field 4.5m longer than its breadth ,half the breadth of field is one third of its length .find the average of its length and breadth ?
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Answer:l = b+20
perimeter = 2(l+b)
= 2(b+20+b)
= 2(2b+20)
= 4b +40 = 280
4b = 240
b= 60m
l = 60+20= 80m
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