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szer= 20cm
gr = 4 cm
1cm szescienny = 0,8 kg
v = 150 *20 *4=12000 cm 3
1cm3 --- 0,8
12000cm3 - ---x
x= 15000 kg
V = 300cm razy 4cm
V = 12000cm 3
12000cm 3 = 1200dm 3
1200dm3 razy 0,8 = 960 kg