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x-il. piątek
12-x -il. czwórek
4.75- średnia ocen
(5x+4 razy (12-x)) :12= 4.75
(5x+ 48-4x) : 12= 4.75 /razy 12
x+48=57
x=57-48
x=9
12-9=3
Odp. Zuzia ma 9 piątek i 3 czwórki