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x- 8%
x= 3,6 kg
46kg- 100%
4,6kg-x
x= 10 %
Uzyskamy 10% roztwor
a) 3,6kg- 5%
x- 100%
x= 72kg
72kg-3,6kg= 68,4
68,4- 45= 23,4 tyle wody nalezy dodac