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X x 0,018 = 5,4 [kg]
X= 5,4 : 0,018
X= 300
odp.: Trzeba wziąć 300 kg wody.
d)
5 x 0,008 = 0,04 kg
5 x 0,04 = 0,2 kg
0,04 + 0,2 = o,24 kg
0,24 :10 = 2,4 % = 24 promili