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length =l breadth=b
here according to question l = 20 + b
and perimeter of rectangle =100 cm
so 2(l+b) =100
2(20+b +b) =100
40 +4b = 100
4b= 60
b=15cm
l=15+20=35cm
so length= 35cm breadth= 15cm
here according to question l = 20 + b
and perimeter of rectangle =100 cm
so 2(l+b) =100
2(20+b +b) =100
40 +4b = 100
4b= 60
b=15cm
l=15+20=35cm
so length= 35cm breadth= 15cm
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