Tickets to a fundraiser are $14 if purchased ahead of time and $25 if purchase at the door. The total raised from all ticket sales was $625. If eleven tickets were purchased at the door, how many tickets were purchased ahead of time?

Megan and desmond each add the same amount of water to their aquarium megan makes 5 ml of chemical solution with every gallon of water for her aquarium desmond mixed 8 ml of chemical solution for every 2 gallon of the water for his aquarium.