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x - 20%
300*20= 3*20 = 60
x=-------------------------------=60dag
100 = 1 = 1
Gospod. musi dodać 60 dag cukru.
masa substancji = ?
Cp= 20 %
cp= ms*100%/mr
20%= ms*100%/3kg /*3kg
20% * 3kg = ms * 100% / : 100%
20% * 3kg / 100% = ms
ms = 0,6 kg = 60 dag
Odp: W wodzie należy rozpuścić 60 dag cukru.
x - 20%
Gospod. musi dodać 60 dag cukru.