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..................... x%
100g 100% ............ x-20
500/100 = 100-x/x-20
100(100-x) = 500(x-20)
10000-100x = 500x-10000
600x = 20000
x = 33,33%
mr1=500 g
Cp1=20%
ms2=ms1+100g
mr2=500g+100g=600g
Szukane:
ms1=?
Cp2=?
Obliczenia:
ms=Cp*mr/100%
Cp=ms*100%/mr
ms=20%*500g/100%
ms=100 g
Dosypano jeszcze 100 g soli, więc 100 g+100 g=200g
Tak więc:
Cp2=200g*100%/600g
Cp2=33,33%