There are about 60 skittles, to begin with and the inequality that represents Callie’s situation is 0.5x - 10 ≤ 20
If she ate half of the skittles, and then she gave her friend Dana 10 skittles, then the amount left will be 0.5x - 10.
If there are no more than 20 skittles left, hence;
0.5x - 10 ≤ 20
0.5x ≤ 30
x ≤ 30/0.5
x≤ 60
This shows that there are about 60 skittles, to begin with and the inequality that represents Callie’s situation is 0.5x - 10 ≤ 20
Learn more on inequalities here: https://brainly.com/question/11613554