Turning off the water while brushing your teeth saves 380 centilliters of water. How many litres of water can you save if you turn off the water the next 2 times you brush your teeth.

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 if no money is deposited or withdrawn except the service charge, how many months until the account balance is negative