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Cena - 13 zl
Cena - 16x+4y=13zl
x+y=1
16x+4y=13
4y=4-4x
16x+4y=13
16x+4-4x=13
12x=13-4
12x=9
x=9/12=3/4
x+y=1
y=1-x
y=1-3/4
y=1/4
Odp: Przecietnie jest 3/4 kg miesa i 1/4 kg kosci w 1 kg miesa z koscia xD