Question Number 10000 by Tawakalitu ayo mi last updated on 20/Jan/17

An analyst was hired to survey 20 students.  He reported that 6 eat eba, 5 eat amala and  7 eat semovita. 9 eat eba or amala, 12 amala  or semovita and 9 eba or semovita. 3 eat all  the three food and 10 eat none. After a careful  analysis of these findings, the analyst was fired.  why ???