Which sets of ratios are a proportion? (Choose all that apply) * 3/11 and 17/6

12/7 and 36/21

60/55 and 7/25

7/6 and 52/48

4/10 and 8/20

Problem 3 a bank charges a service fee of $7.50 per month for a checking account. a bank account has $85.00. if no money is deposited or withdrawn except the service charge, how many months until the account balance is negative