Step-by-step explanation:
Given

Answer:
5
Step-by-step explanation:
5rrrrrrrrrrrrrffrrffjfhrhrhrhffhffh
If there are 4 pens there will be 1 pencil, if there is 1 pencil there will be 4 pens
If the ratio is factored to a number, let's say 3, then there will be 12 pens for every 3 pencils
I’m not 100% sure kind of a guess but I would x=2/3. Good luck