Answer
34.69 psi
Work Step by Step
From Amonton's law we have that P/T = constant.
First we must convert from F to Kelvin:
C = (F-32)/1.8
so 75F is (75-32)/1.8 = 23.89 C
and 120F is (120-32)/1.8 = 48.89 C
Then we add 273 to convert to K
23.89C --> 296.89 K
48.89C --> 321.89 K
Therefore, we have the initial P of 32 psi and initial T of 296.89F
The final T is 321.89F so we can say:
P/T = P/T
or
32psi/ 296.89K = P / 321.89K
P = 34.69 psi