Reverse Percentage Problem: Finding Total Students from 80% Boys and 12 Girls

80% of the students in a class are boys, while the number of students who are girls is 12. How many students are there in total?

To solve this problem, we'll first determine the percentage of students who are girls and then use it to find the total number of students.

1. Determine the percentage of students who are girls. Since 80% of the students are boys, it follows that 20% are girls.

2. We know that 20% of the total number of students is equal to 12 (the number of girls). We can set up the equation:

$0.20 \times \text{Total students} = 12$

3. Solve for the total number of students:

$\text{Total students} = \frac{12}{0.20}$

$\text{Total students} = 60$

Therefore, the total number of students in the class is $60$.