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20razy 6=120 220-120=100zł
100:2=50zł <- Jedna filiżanka
220 : 11 = 20
x - cena filiżanki
2x + 6 * 20 = 220
2x = 220 - 120
2x = 100 /:2
x = 50
odp. kubek kosztuje 20 zl, a filiżanka 50 zł
a więc 2 filiżanka 220-6*20=100
więc jedna 50 zł