Let's represent the number of colored pencils originally in the pencil box as "x".
After sharing them equally between you and your friend, each of you will have x/2 colored pencils.
You then add 3 more colored pencils to your own box, so you have x/2 + 3 colored pencils.
This gives you a total of 15 pencils, so we can set up the equation:
x/2 + 3 = 15
Solving for x:
x/2 = 15 - 3
x/2 = 12
Multiplying both sides of the equation by 2, we get:
x = 2 * 12
x = 24
Therefore, you originally had 24 colored pencils in your pencil box.
You originally have x colored pencils in your pencil box. You share them equally between you and your friend. You add in 3 more colored pencils to your own box after sharing them. This gives you a total of 15 pencils.
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