In a survey of employees at a fast food restaurant, it was determined that 14 cooked food, 19 washed dishes, 25 operated the cash register, 10 cooke
food and washed dishes, 7 cooked food and operated the cash register, 10 washed dishes and operated the cash register, 5 did all three jobs, and 5
did none of these jobs. Complete parts a) through f) below.
a) How many employees were surveyed?
(Simplify your answer(