Calculate the temperature of an argon sample at 55.4 kPa and 18.6L if it occupies 25.8 L at 75.0 degrees C and 41.1 kPa. I know the answer is 65.

Calculate the temperature of an argon sample at 55.4 kPa and 18.6L if it occupies 25.8 L at 75.0 degrees C and 41.1 kPa. I know the answer is 65.2 degrees C but I am confused as the what formulas were used and how the answer was reached. If someone could write a step by step I would appreciate it!