We know that
• There are 80 students in the history class.
,
• He needs 25% of the students to pass.
To know the number of students that must pass, we just have to multiply 0.25 with 80 since 0.25 is equivalent to 25%.
![0.25(80)=20](https://img.qammunity.org/2023/formulas/mathematics/college/jpbskolvotz3c7htpdedf2fc3gkoci3l7l.png)
Therefore, 20 students must pass.