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 separated 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_i = F_totalx_i

Which number do you think we can find next for our table based on our trick?

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