Worth 30 points your class is going on a field trip. twenty four students have turned in their permission slips so far. this is 80 percent of the students in the class. how many students are in the class

Remark 
There are many ways you can set up the problem. The conventional way is to set up a % equation

Givens
Let x = the number in the entire class.
Let 80% of the class = 24

Argument
80% of x = 24 Change 80% to a fraction.
80/100 * x = 24  Divide by 100
0.8 x = 24           Divide by 0.8
x = 24 / 0.8
x = 30

There were 30 people in the class.