Hello!
We know that any given percentage can be expressed as a fraction with a denominator of 100, as follows:

Because we want to find 25% of the celery sticks, we can convert this percentage into the following fraction:

=

Now multiply this reduced fraction by the number of celery sticks:
44 ×

=

The fraction

can be reduced to a value of 11. We have now proven that
11 celery sticks received peanut butter.
I hope this helps!