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Cp=¼/1
Cp = ¼ = 25%
Cp=ms/mr |*mr
ms=Cp*mr |:Cp
mr=ms/Cp
mr=¼/10%
mr=10/4=2,5l - tyle wody musi być w drugim napoju
2,5-1=1,5l - tyle trzeba dolać
Odp. Aby otrzymać napój 10% trzeba dolać 1,5l wody.