Answer: The box of pencils has a total of 12 pencils inside the box.
Explanation:
Each pencil weighs 3/10 or 0.3 oz.
Since the total weight of the box is 0.4 ounces, subtract that with 4 oz- the total weight of the box. You then get 3.6 ounces worth of pencils.
To find how many pencils that are in the box, you will need to divide 3.6 with the amount 0.3.
3.6/0.3 = 12
Therefore, the box of pencils has a total of 12 pencils inside the box.