Physics Question regarding pressure?

Question

The question I want to know is Question number 10. Please go:

http://bp1.blogger.com/_WGLDvoTGYDw/RZtzvVsDeVI/AAAAAAAAAAM/wytRunznJEs/s1600-h/Question.jpg

to view the picture. Sorry because the question i want to ask consist of diagram and apparently yahoo answers does not have a picture uploading function

Answer 1

try using Boyle's Law, (P1)(V1) = (P2)(V2)
* P = pressure, V = volume of air
diagram 1 shows the amount of air (in the tube) due to air pressure.
diagram 2 shows the amount of air (in the tube) due to air pressure + the 76mmHg of mercury.

hope this info helps you in figuring out the answer :)