Calculating Total Homework Hours from Graph

A graph displays the following data about the number of hours students spent on homework per week over the course of a month:

The average hours per week for Week 1 was 4 hours, Week 2 was 6 hours, Week 3 was 8 hours, and Week 4 was 10 hours.

Using this data, calculate the total amount of homework hours spent by two students during this month.