Solution: Let Xiao Ming's age be X and his mother's age be 3x.
3x-x=24
2x=24
x= 12
12*3=36 (years old)
Answer: (I omit the answer, you answer it yourself)
8. solution: let the smaller number be x,
The other is x+ 1.
x+ 1+x=97
2x+ 1=97
2x=96
x=48
48+ 1=49
A: ...............
9. Solution: X shipments should be made in the afternoon.
5*3+5x=35
15+5x=35
5x=20
x=4
A: .............
I hope it can be adopted, and my answer is correct.