Hello, Brandy,
As per my earlier responses, just rearrange the equation to isolate the unknown variable, make a table of the information, check the units (need K,etc.), make a prediction, and solve. Temperature stays constant, so just canle that term.
V2 = V1(T2/T1)(P1/P2)
Do these steps and you'll find a new volume of around 12 liters.
Bob