Comprehension Passage
Directions:
Study the bar graph carefully and answer the following questions:
Five companies (A, B, C, D, and E) sell skill courses. The bar graph below shows the number of skill courses sold by these companies in three years (2020, 2021, and 2022).

Find the average number of skill courses sold by companies B, C, and D together in three years.
1
820
2
810
3
830
4
800
5
850