September 2018 3 22 Report
Zd1> zmieszano 1litr 10% roztworu soli z 2litrami 15% roztworu.jakie stezenie ma otrzymany roztwor?

zd2> zmieszano 200g twarogu o zawartosci 30% tluszczu z 250g twarogu o zawartosci 12% tluszczu. ile % tluszczu zawiera otrzymany twarog?
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