An airtight box has a removable lid of area 1.19E-2 m2 and negligible weight. The box is taken up a mountain where the air pressure outside the box is 8.67E+4 Pa. The inside of the box is completely evacuated. What is the magnitude of the force required to pull the lid off the box?

Answer 1

Well F = P/A
I guess that's what they're looking for.