You will be given a definition of a task first, then some input of the task.
You are given a math word problem and you are supposed to apply addition or subtraction mathematical operators on the numbers embedded in the text to answer the following question and then only report the final numerical answer.

At the town carnival Billy rode the ferris wheel 7 times and the bumper cars 3 times . If each ride cost 5 tickets , how many tickets did he use ?
Output:

Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
user
50