Question 331142
let pens sold be x
pencils sold will be x+8
..
cost of pen = 20 cents
cost of pencils= 5 cents
..
total sales = 890 cents
..
20x+5(x+8)=890
20x+5x+40=890
25x=890-40
25x=850
x=34 pens sold
pencils sold = x+8 = 34+8=42
..

CHECK
34*20+42*5=890