Question 330434
{{{PV = nRT}}}
You are told that P and n don't change. R is a constant. So the relationship between Volume and Temperature is direct.
You can then write this as

{{{V/T = nR/P}}} 
Since everything on the right side is held contstant, you can then say
{{{V[1]/T[1] = V[2]/T[2]}}} 
Now just plug in the givens and solve
{{{20/273 = 30/T[2]}}}
{{{T[2] = 30*273/20}}}
{{{T[2] = 409.5}}} Kelvin