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k= 2 (p+l)
100= 2 (p+p-10)
100= 2(2p-10)
100= 4p-20
100+20=4p
120=4p
30=p
l=p-10
l=30-10=20
p=30, l=20
L= Pxl
=30x20=600
p=10+l
K = 2(p×l) = 100
2((10+l)×l)=100
2(10l+2l)=100
20l+4l=100
24l=100
l=100/24=25/6
p=10+25/6
p=60/6+25/6
p=85/6
L=p×l=85/6×25/6
L=2125/36