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500g- 100%
x- 20%
100x=1000g / :100
x=100g (ilość cukru)
przekształcamy wzór:
ms = Cp*mr /100 (%)
ms = 20(%) * 500g /100(%) = 100g
Można też z równania proporcji:
20g --- 100g
xg ----500g
x = 20*500/100 = 100g