Chemistry Density Question! Need Help!?

I do not know how to go about this question. A flask filled with ethanol at 20 degrees Celsius has a total m of 61.742 g. The flask is emptied and some ball bearings with a m of 21.784 g are added to the flask. The flask is topped off with ethanol and now the total m is 81.604 g. Calculate the density of the ball bearings at 20 degrees Celsius. The density of ethanol at this temperature is 0.78945 g/cm^3.