Answer:
The absolute pressure of the system is 12.7 psia.
Step-by-step explanation:
Let suppose that system works at an atmospheric pressure of 14.7 psia, the absolute pressure is equal to the atmospheric pressure minus vaccum pressure, that is:

Where:
- Absolute pressure, measured in pounds per square inch.
- Atmospheric pressure, measured in pounds per square inch.
- Vacuum pressure, measured in pounds per square inch.
Given that
and
, the absolute pressure of the system is:


The absolute pressure of the system is 12.7 psia.