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1,5x - bilet normalny
x+1,5x= 30
2,5x = 30 /:2,5
x = 12 - bilet ulgowy
12 * 1,5 = 18 - bilet normalny
y-ulgowy
x=1,5y
2.5y=30
y=12
x= 12*1.5=18
18-12=6