which model shows 20%?

Explanation:

Step1: Recall percentage formula

Percent = $\frac{\text{Part}}{\text{Whole}}\times100%$

Step2: Analyze first model

There are 8 equal - sized parts in total, and 2 are colored. So the percentage is $\frac{2}{8}\times100% = 25%$

Step3: Analyze second model

There are 3 equal - sized parts in total, and 1 is colored. So the percentage is $\frac{1}{3}\times100%\approx33.3%$

Step4: Analyze third model

There are 10 equal - sized parts in total, and 2 are colored. So the percentage is $\frac{2}{10}\times100% = 20%$

Answer:

The third model.