In a survey of employees at a fast food restaurant, it was determined that 13 cooked food 14 washed dishes, 23 operated the cash register, 5 cooked food and washed dishes B cooked food and operated the cash register 10 washed dishes and operated the cash register, 4 did all three jobs, and 7 did none of these jobs
Complete parts a) through ) below
a) How many employees were surveyed?
(Simplify your answer