IAQ and HVAC Lab - Flow Rate Question

Question

For the IAQ and HVAQ Lab, specifically regarding Question 2, no value is given in the PDF for Qe (Exhaust Flow Rate). In Question 1, the Excel sheet said to assume that Qv=Qe= 800 m3/h. Is this true for all questions, that Qv = Qe?
So in Question 2, does the assumption continue that Qv = Qe? Or is there a relationship with the Total Air Flow Rate of 7200 m3/h that must be considered? Does Qv + Qe have to equal Qt? If this is the case, how can both Qv and Qe equal 800 m3/h in the first question?

Answer

Please see the second from the bottom paragraph on page one – algebra in there governs the relationship between Qv and Qe.