# Mass balance of a recycle stream

I'm a chemical engineer student and I have just started to learn about mass balance without reaction.

This is my problem -

I want to find Out the mass composition and mass flowrate of stream Y (the stream into the divider).

How am I suppose to do a mass balance around process 1 (involving the divider, before process 2) ?

From the problem , I don't know any of the compositions of the recycle 1 , I only know the flow rate .

This only tells me that the flowrate into process 1 is $50000+ 1500$ . With this alone, how do I find mass composition and mass flowrate of stream Y