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 * * *.