A stream containing methanol, acetone and nitrogen ( ) is being fed to a pressurized vessel. The mass ratio of acetone to methanol in the feed was found to be 2 kg-acetone/kg-methanol. The mass ratio of acetone to nitrogen in the feed was found to be 0.75 kg-acetone/kg-nitrogen. Determine the molar composition (i.e. mole percentages) of acetone, methanol and nitrogen in the feed stream.