What is wrong with this scenario and what can be done to rectify it?

There is nothing wrong with this scenario-this question uses a number of different things to spin your head around, but if you go through the steps of calculating the inspiratory flow rate (.600/1)*60 = 36l/min.now that we know the patients flow rate, we can calculate what we are giving him with the current setup. at 40% the air:oxygen ration turns out to be 3:1 (100-40)/(40-20) = 60/20 = 3/1knowing that we can figure out that at 10l/min the patient is receiving 10l/min o2 + 30l/min entrained room air = 40l/min at fio2 of 40%.since the patient is receiving 40l/min and only requires 36l/min everything addressed in this scenario should be fine.interestingly enough, whoever didnt follow the guidelines on the nozzle knew that at 8l/min the patient would only be receiving 32l/min and would not get the full inspiratory requirement.strangely enough, i thought i was pulling these numbers somewhat out of the air but then noticed earlier that sibbersons uses the same sort of example (p.52).