Solution: Let Xiao Gang have X copies.
3X-X= 16 8+ 16=24 sheets.
Solution: 2X= 16
2X/2= 16/2 A: Xiao Gang 8, Xiao Ming 24.
X=8
2.
Solution: Let's leave for X hours.
(75+85)X=576
Solution: 160X=576 A: I walked for 3.6 hours.
160 x/ 160 = 576/ 160
X=3.6