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a=8i3/4m
b=8i3/4 :5=35/4*1/5=35/20=1i15/20=1i3/4
O=2*8i3/4+2*1i3/4
O=2*35/4+2*7/4=70/4+14/4=84/4=21
odp.
Pani Ala musi kupić 21 metrów płotka.