Assuming ideal behavior of the helium gas for a fixed amount, the value of PV/T is constant, that is,
P1V1 = nRT1, P2V2 = nRT2
If the gas is compressed to precisely half the volume and the absolute pressure is equal to gauge pressure plus atmospheric pressure, we rearrange the expression to solve for the temperature:
T2/T1 = (P2/P1)(V2/V1)
T2 = (P2/P1)(V2/V1)T1
T2 = (2.00atm/1.350atm)(1/2)(283K)
T2 = 210 K = -63°C