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y- ilosc banknotow 50 zl
x=y
100x+50y=12000zl
150y =12000/:150
y=80=x
x=80
Odp. Pan Kowalski otrzymal 120 banknotow
y-ilosc banknotow 50 zl
x=y
100x+50y=12000
150y=12000
y=80=x
Odp.Pan kowalski otrzymal 160 banknotow.