Answer: Six employees
Explanation: If the average time it takes to clean one room is half an hour, then during an eight-hour shift, each employee can clean sixteen rooms, i,e if one employee cleans two rooms in an hour, then one employee will clean sixteen rooms in eight hours. This means that for a total of 96 rooms, it takes:
the total number of rooms divided by the number of rooms that one employee can clean during the eight-hour shift
total of 96 rooms / 16 rooms that one employee can clean = 6 employees
which means they will need six employees to clean all 96 rooms during a shift of eight hours.