BEBRAS 2018 Grade 7-8 Round 2 Ext Question 8

Ten beavers need computers to write and edit their school newspaper. Red cells in the schedule mark the time slots each beaver needs. All computers are identical and at most one beaver can use a computer at a time. What is the minimum number required?



Columns run 8:00,9:00,10:00,11:00,12:00,13:00,14:00; rows are beavers 1–10.