x+3y= 18

2x+5y=3 1

x=3

y=5

2. Let the number of purchased pens be X, the number of purchased notebooks be 48-X, and X is not more than 24.

3x+5(48-x)& lt； =200 (less than or equal to)

X & gt=20 (greater than or equal to)

So the value range of x is 20-24, and there are five kinds of * * *.