How many balloons can you fill from a 10 liter tank of heliu…

How many balloons can you fill from a 10 liter tank of helium you purchased? The tank has an initial pressure of 1500 psi. Also, you know that, when filled to the recommended 25 psi, each balloon will hold a volume of 5.5 L. (Hint: Don’t forget that you can’t remove the last 10 L from the tank.)