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V walca= πr²*H=π*(1m)²*5m= 5πm³= 5*3,14m³=15,7m³
4V= 15,7m³*4= 62,8m³
250kg= 0,25 t
z proporcji
0,25t=1m³
x=62,8m³
x=15,7 t