3) it takes 30 minutes for a patient to be checked when 5 medical staff are working how long will it take if 15 medical staff are working?


4) the research takes 125 days to complete if 5 people work on it find how many people are needed to complete the research in 25 days?



5) if there are 6 builders it takes 80 days to complete the house how many builders must employ to build the house in just 16 days?​