Question: at a certain resort , each of the 39 food service employees is trained to work in a minimum of 1 restaurant and a maximum of 3 restaurants . the 3 restaurants are the family buffet , the dining room , and the snack bar . exactly 15 employees are trained to work in the family buffet , 18 are trained to work in the dining room , and 12 are trained to work in the snack bar . if 4 employees are trained to work in exactly 2 restaurants , how many employees are trained to work in all 3 restaurants ?
A) 2
B) 3
C) 4
D) 5
E) 1
Correct answer: e
Grade: 7 | Topic: Statistics and Probability | Difficulty: Hard | Standard: 7.SP.C.8