Answer: 4 more pencils than markers
Explanation:
The ratios are pens to pencils is 2:3 and the ratio of markers to pencils is 1:3. Since there are 4 pens there'll be 6 pencils, and since the ratio of markers to pencils is 1:3, there'll be 2 markers.
Markers: 2
Pencils: 6
Pens: 4
Since you have to find how many more pencils then markers there are, you'll have to subtract the number of pencils by the number of markers.
6-2=4
There are 4 more pencils than markers