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x+2 - ilość roztworu
0,2(x+2) - ilość soli
x=0,2(x+2)
x=0,2x+0,4
x-0,2x=0,4
0,8x=0,4 /:0,8
x=0,5kg - ilość soli
mw = 2 kg
ms/mr = Cp/100%
mr = ms + mw
ms/ms+mw = Cp/100%
ms*100% = (ms+mw)*Cp
ms*100% = 20% ms + 20% * 2kg
ms = 2/10 ms + 4/10
8/10 ms = 4/10 / * 10
8 ms = 4 /:8
ms = 0,5