Help with this problem

Question

45 liters of an ideal gas were under a pressure of 5 newtons per square meter. When 15 liters were added and the pressure increased to 10 newtons per square meter, the temperature became 900 Kelvins. What was the original temperature?

A) 2400 Kelvins

B) 225 Kelvins

C) 337.5 Kelvins

D) 600 Kelvins

E) none of these

Got 337.5 Kelvins, is this correct?

Answer 1

Yes, this is the right answer. It follows from physics equation

(p₁V₁) / T₁ = (p₂ V₂) / T₂