what james bought 12 cookies and ate 3 of them. He ____%?

To calculate the percentage of cookies James ate, we can use the formula:

Percentage = (Part / Whole) * 100

In this case, the part is the number of cookies James ate (3), and the whole is the total number of cookies he bought (12).

Percentage = (3 / 12) * 100

Percentage = 0.25 * 100

Percentage = 25%

Therefore, James ate 25% of the cookies he bought.