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V=0,3mx20mx20m= 120m3
120m3:4m3=30
Odp: Trzeba przywieźć 30 takich ciężarówek
30 cm = 0,3 m
0,3 * 400 = 120 m^3
4 m^3 - 1 ciężarówka
120 m^3 - x
x= 120/4 = 30 ciężąrówek