10(25) is the money that the League made for the sale of the first 25 tickets ($10 each), 12(x-25) is the money that the League made with all the tickets MINUS the first 25.
So in the end you have the money of the first 25 tickes + the money of the other ones = all the money made.
do you want to be friends cos i riley riley riley riley riley riley need some friends because i only have 2 friends and 1/2 of the answer is 0 and the other 1/2 of the answer is 13 so your answer is 13 because 0-13=13 please follow me and i'm not saying this in a weird way i just need some flowers and some friends...please i'm begging you please friend me and follow me!!!................