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x - ilość czwórek
y - ilość piątek
x + y = 12
(4x + 5y ) : 12 = 4,75
x = 12-y
[ 4(12-y) + 5y] : 12 = 4,75
x = 12-y
(48 -4y + 5y ) : 12 = 4,75 /*12
x = 12-y
48 +y = 57
x = 12 -y
y = 57 - 48
x = 12 -y
y = 9
x = 12-9 = 3
y = 9
x = 3 oceny dobre (czwórki)
y = 9 oceny bardzo dobre (piątki)