Keeping track of information with a table

One thousand kilograms per hour of a mixture of benzene (B) and toluene(T) that contains 50% benzene by mass are seperated by distillation into two fractions. The mass flow rate of benzene in the top stream is 450 kg B/h, and that of toluene in the bottom stream is 475 kg T/h. The operation is at steady state. Write balances on benzene and toluene to calculate the unknown component flow rates in the output streams.

F_total = F_bottoms + F_bottoms

1000 = F_bottoms + 525

F_bottoms = 1000 - 525 = 475 kg/h.

Streams\mass flow rate	Total	Benzene	Toluene
Feed	1000	500	500
Overhead	475	450
Bottoms	525	50	475

Now, only one equation to go!

F_{total, toluene} = F_{overhead, toluene} + F_{bottoms,toluene}

Where should we click next to use this last equation? (Only one choice here!)