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x - 5g
x=10g substancji
200-75=125
Cp=ms/mr*100% = 10/125 *100% = 8%
200 g × 5% = x × (200 g - 75 g )
200 g × 5/100 = x × 125 g I 125 g
10g / 125g = x
x =8 %