Question 21
Each of 50 nurses works at least one of the morning, afternoon and night shifts. The shift counts are shown. What is the least possible number working all three shifts? Chart labels: morning, afternoon, night.
Editorial note: the supplied answer key is inconsistent with the attendance totals; the reference solution explains the discrepancy.
Editorial note: the supplied answer key is inconsistent with the attendance totals; the reference solution explains the discrepancy.