A certain volume of a gas at 298kelvin is heated such that its volume and pressure are now four times their original value.What is the new tewperature?

Answer 1

Use (P1V1/T1) = (P2V2/T2)
The easy way to do this is to make up a convenient number for P1 and V1 and multiply by 4 to find P2 and V2.
Another way is to call P1 = P1, then P2 = 4P1.
While V1 = V1 and V2 = 4V1

Answer 2

V1-40
V2-160
P1-90
P2-360
T1-298K
T2-?
V1P1/T1=V2P2/T2