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y - liczba krówek
1/2x + 1/3y = 18|*6
1/2x = 2/3y|*6
3x+2y=108|:2
3x=4y
y=54-1,5x
3x=4(54-1,5x)
y=54-1,5x
3x=216-6x
y=54-1,5x
3x+6x=216
y=54-1,5x
9x=216|:9
y=54-1,5x
x=24
y=54-1,5*24
y=54-36
y=18
odp: W torebce zostały 24 cukierki