Question

An ideal gas is stored in a container at constant volume. If the temperature (T) were increased to 3T, what would be the change in pressure (P)?

Answer 1

According to Gayle Lusac's law, pressure is proportional to absolute temperature of a gas. Thus:
P/T = constant

So if the temperature becomes 3T, the pressure would increase to 3P

Answer 2

It will increase to 3P. 

I hoped I helped and if you need more you can always ask me :)
-Dawn