the expenses of a boarding house is partly fixed and partly varies with the number of boarders. Each boarder pays $390 a month. The profits are $54 per head per month. When there are 60 boarders, what is the profit per head per month where there are 80 boarders

Neoli is a nurse who works each day from 8: 00 am to 4: 00 pm at the blood collection centre. she takes 45 minutes for her lunch break. on average, it takes neoli 15 minutes to collect each sample and record the patient's details. on average, how many patients can neoli see each day?