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v=50×20×30×30000 cm3
30l÷2=15l 15l=15kg
b)3l=3000 cm3
v=3000 cm3
v=a×b×c
v=50×20×3=3000 cm3
3000 cm3 = 3 cm
b=2dm
H=1.5dm
V=a*B*H
V=5dm*2dm*1.5dm
V=10dm*1.5dm
V=15dm3=15l=15kg
15dm3+3dm3=18dm3-powierzchnia po dolaniu wody
3dm*3/4=2.5dm3-odp;należy dolać 2.5litra wody