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zeszyty
5 * 0,80zl = 4,00zl
olowki
5zl - 4zl = 1zl
za 1zl moze kupic
1zl : 0,30zl = 3,33
Helenka moze kupic tylko 3 olowki
5-4=1
1-3*30gr=1-90gr=10gr
Może kupić co najwyżej 3 ołówki.