Keeping track of information with a table

One thousand kilograms per hour of a mixture containing equal parts by mass of ethanol and water is distilled. Product streams leave the top and the bottom of the distillation column. The flowrate of the bottom stream is measured and found to be 673 kg/h, and the overhead stream is analyzed and found to contain 96 wt% ethanol. Find the flowrates of all components in all streams.

You correctly claimed that we can find the flowrates of water and ethanol in the feed stream from the information given in the problem statement. Generally,

F_feed,water = F_feed,total * x_feed,water

F_feed,ethanol = F_feed,total * x_feed,ethanol

So all we need to do is figure out the compositions (mass fractions) of water and ethanol in the feed stream in order to fill in the entire top row.

What is the mass fraction of water in the feed stream?
What is the mass fraction of ethanol in the feed stream?

Streams\mass flow rate	Total	Ethanol	Water
Feed	1000	F_feed,ethanol	F_feed,water
Overhead	327	F_{overhead,ethanol}	F_{overhead,water}
Bottoms	673	F_{bottoms,ethanol}	F_{bottoms,water}