Since Sophie can grade 11 papers per hour
Since she worked for 5 hours, then
Multiply 11 by 5 to find the number of the graded papers
[tex]11\times5=55[/tex]Since the total number of papers is 86, then to find the number of the remaining papers subtract 55 from 86
[tex]86-55=31[/tex]There were 31 paper Sophie has to grade after working 5 hours