Respuesta :

crowne
y = youth ticket
y+18 = adult ticket

12y + 7(y+18) = 525

12y + 7y + 126 = 525

19y + 126 = 525

19y = 525 - 126

19y = 399

y = 399/19

y = 21

A youth ticket costs $21

wow my brain woke up