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4,75*12=5*x +4*y
x=12-y
57 = 5* (12-y) + 4*y
57= 60-5y +4y
-3=-y
y=3
x=9
Ma 9 piatek i 3 czworki
Odp: Zuza ma dziewięć 5 i cztery 4.
Pozdro:)