When doing exercises during recess, 25 students lined up. Xiao Li counts from the left. He is the tenth person. From the right, he should be the first person.
LZ If you want to know, you can look at the pictures ("★" is Xiao Ming, "△" is Xiao Liang, and the rest are classmates):
Left ○★ ○ △ ○ Right
Obviously, the answer has come out. The correct answer is: 5.
Formula:
10-2-3=5