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l=2*20+2*40
l=40+80
l=120m
brama 4m
2 frtki 2*1m=2m
4+2=6m
120m-6m=114m
Odp:Pan Adam musi kupić 114m siatki na ogrodzenie działki
120m-4m-2 x 1m =120m-4m-2m= 114m