Solve the below probloem:
Q: A 35 ft3 rigid tank has propane at 15 psia, 540 R and connected by a valve to another tank of 20 ft3 with propane at 40 psia, 720 R. The valve is opened and the two tanks come to a uniform state at 600 R. What is the final pressure? You should solve the given problem step by step.You must include all the steps which are needed to complete the given problem