Fifth grade math. Homework is divided into one group, each person has 7 more copies, and each person can't get 9 copies. How many people are there in a small group? How many copies?
Solution: Suppose there are X people in a group.
7X+7=9(X- 1)
7X+7=9X-9
7X+7-7X=9X-7X-9
2X-9+9=7+9
2X= 16
2x \2 = 16 \2
X=8
I'm exhausted ~