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(25x+35y)-1/4*(25x+35y)=4650
x=200-y
¾*25x+3/4*35y=4650
x=200-y
18,75x+26,25y=4650
x=200-y
18,75*(200-y)+26,25y=4650
x=200-y
3750-18,75y+26,25y=4650
x=200-y
7,5y=900 /:7,5
x=200-y
y=120
x=200-120
y=120
x=80
y=120
Odp: Było 120 biletów droższych i 80 biletów tańszych.