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0%\
20%/ 5%
i wychodzi z niej 3:1
rownanie
x/300=3/1
x=900g wody
2
tu tez reguła krzyzowa:
0%\
10%/ 4%
wychodzi 3/2
x/500=3/2
2x=1500
x=750g wody -> zamienic na mole:
750-x moli
18-1
x=41,6 mola