Only one variable can be changed at a time

Here’s one way to follow the scientific method. place the missing steps in the correct position in the process

If i initially have a gas at a pressure of 12 atm, a volume of 23 liters, and a temperature of 200 k, and then i raise the pressure to 14 atm and increase the temperature to 300 k, what is the new volume of the gas?

Which suspect most likely committed the robbery and how do you know