To solve this problem, one strategy that could be used is setting up a variable equation. Let's let the variable x represent the normal ticket price. Since each ticket was $3 less than the normal price, we can subtract 3 from x to find the discounted ticket price. According to the problem, we had to pay $12 for each ticket, so we can set up the equation x - 3 = 12. By solving this equation, we can find the value of x, which represents the normal ticket price. Another strategy that could be used is trial and error. We can start by subtracting $3 from $12 to see if the result is a whole number. If it is, then we have found the normal ticket price. If not, we can try subtracting $3 from a smaller number until we find the correct price.

Once we find the normal ticket price, we can calculate the total cost of the tickets. Since there were ten tickets purchased, we can multiply the normal ticket price by ten. This will give us the total cost of the tickets. Finally, we can subtract the total cost of the tickets from the $120 budget to determine how much money is left.