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1. kubek 5 l o temp 80
2. x l o temp 20
3. kubek 5 l +x o temp 50
5*80 +20x = (5+x)*50
400 + 20x = 250 + 50x
150 = 30 x / 30
5 = x
odp trzeba dodac 5 l wody
:)