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y-dziewczynki
x+y-wszyscy uczniowie
y+120=x
5/12=y:(x+y)
12y=5x+5y
y+120=x
7y=5x
y+120=x
7y=5(y+120)
y+120=x
2y=600
y+120=x
y=300
x=420
razem 720
więc chłopcy- 7/12
wszyscy razem 12/12
7/12- 5/12= 2/12
2/12= 120 |*6
12/12= 720