You have $83 to spend at an amusement park. Ride tickets are $4 to $7 each. What is the range of number of rides you can get on if you need no less than $35 for food and souvenirs?

Well what you want to do is subtract 35 already from 83 resulting in 48$, because the 35$ is gonna be used no matter what. So next you just divide by 4 and 7 and get 6-12, 6 because you can't do 1/7 of a ride and just get off, so u round.