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    Hi people,
    I have a problem with chapter 12.1 (Gases) question 4b (page 211) of AQA Physics A book.
    I can't seem to solve the question by either using ratio or Boyle's Law.
    Please help.

    Here is the question:
    Question4)

    A Hand pump was used to raise the pressure of the air in a flask of volume 1.2x10^-4 m^3, without and then with powder in the flask.
    - Without the powder in the flask, the pressure increased from 100kPa to 135kPa.
    - With 0.038kg of powder in the flask, the pressure increased from 110kPa to 141kPa.

    a) Show that the volume of air in the hand pump initially was 2.7x10^-5 m^3
    b) Calculate the volume and the density of the powder.


    The book answer for b) is 2.3x10^-5 m^-3, 1600 kg m^-3
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