Answer: 13 small boxes and 9 large boxes were shipped.
Step-by-step explanation:
Let x represent the number of small boxes shipped.
Let y represent the number of large boxes shipped.
A total of 22 boxes of paper were shipped. It means that
x + y = 22
Each small box of paper weigh 35 pounds and each large box of paper weighs 65 pounds. The total weight of the boxes that were shipped is 1040 pounds. It means that
35x + 65y = 1040- - - - - - - - - - 1
Substituting x = 22 - y into equation 1, it becomes
35(22 - y) + 65y = 1040
770 - 35y + 65y = 1040
- 35y + 65y = 1040 - 770
30y = 270
y = 270/30
y = 9
x = 22 - y = 22 - 9
x = 13