If, when a gas was heated in a closed vessel by 140 K, its pressure increased 1.5 times

If, when a gas was heated in a closed vessel by 140 K, its pressure increased 1.5 times, then what was the initial temperature of the gas?

Given:
Delta T = 140 K;
P2 = 1.5 P1.
Find: T.
Decision:
Let’s make a proportion that will help us find T.
P1 / T = P2 / T + delta T.
Let’s transform:
1 / T = 1.5 / T + delta T.
From this we get 0.5 T = delta T.
We find T, since T = 2 * delta T, it turns out that T = 2 * 140 = 280 K.
Answer: 280