Pharmaceutical Calculations Williams And Wilkins Rapidshare Help Me With Pharmaceutical Calculations PleasE?

Help me with pharmaceutical calculations pleasE? - pharmaceutical calculations williams and wilkins rapidshare

Insoluble a weight of 12 grams of powder. A specific gravity bottle, which weighs 21 grams empty and weighs 121 g when filled with water. If dust is in the bottle and the bottle filled with water, all three together weigh 130 grams. What is the specific weight of the wheel?

help me please? I would like to know.