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x+y=20kg
10x+2y=160
x=20-y
10(20-y)+2y=160
x=20-y
200-10y+2y=160
x=20-y
-8y=160-200/:-8
x=20-y
y=5
x=20-5
y=5
x=15
odp: jest 15kg solanki 10-procentowej i 5kg solanki 2-procentowej