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P=a*b
P=400m*300m
P=120 000m²
1a=100m²
0,25ara=25m²-tyle zajmuje jedno drzewko
120 000m²:25m²=4800
odp.zasadzono 4800 drzewek
P=300*400
P=120 000 m2
120 000/25=4800
ODP
Posadzono 4800 drzew