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200[kg] wody zawiera x[kg] soli
Rorwiazujemy wiec proporcje
120/200=0,7/x
3/5=0,7/x
3x=5*0,7
3x=3,5/:3
x=3,5/3
x=35/30
x=7/6
200[kg] wody morskiej zawiera 7/6[kg] soli