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
![11*5=55](https://img.qammunity.org/2023/formulas/mathematics/high-school/gsn7kn77ly5lzatzhv5nfvo374m9ln94y0.png)
Since the total number of papers is 86, then to find the number of the remaining papers subtract 55 from 86
![86-55=31](https://img.qammunity.org/2023/formulas/mathematics/high-school/4huj3b5l78ma6f4hbyfwn757yhrytirbz3.png)
There were 31 paper Sophie has to grade after working 5 hours