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y Cukierki za 20zł
Waga mieszanki to 15kg,a cena 290zł
18x + 20y = 290
x+y = 15
x=15-y
18(15-y) + 20y = 290
270 -18y +20y = 290
2y=20 / : 2
y=10
x=15-10 = 5
x=5[kg] cukierków po 18zł
y=10[kg] cukierków po 20zł