Check my work:

a gas at 65c occupies 4.22l. at what temperature will the volume be 3.87l, assuming constant pressure? make sure you show: problem set up, units and an answer with units
answer
t1 = 65c -> 338.2k t2 = ?
v1 = 4.22l -> 4220ml v2 = 3.87l  3870ml

4220ml = 3870ml
338.2k t2

338.2k * 3870ml = 4220 ml
t2

t2 = 310.15k

For the answer to the question above, this is my answer to your problem.

You can leave the pressure out of both sides of the equation since the pressure is constant to make it easy.

so all you have is volume over Temp = new volume over new temp which is we don't know.

4.22 liters over 338 Kelvin = 3.87 liters over T 

cross multiply and solve for T which comes out to be 310 degrees K or 37 degrees C
Yes you are right it is 310