Answer:
For every 84 pens there are 112 pencils in the box.
Explanation:
We are given the following information in the question.
We are given a ratio of pens to pencil is 84 to 112.
Ratio is a relationship between two numbers that helps us to know how first number is related to the second number.
This can be written as: 84 : 112
This can be read as: For every 84 pens there are 112 pencils in the box.
Simplifying the fraction we have:

This ration can be written as 21 : 28 which means for every 21 pens in a box there are 28 pencils in the box.