The 20 girls in the class represent 55% of the students in the class. How many students are in the class?

36 students

Step-by-step explanation:

1. Set up a proportion. Since we are trying to find out the number of students in the class, that number will be x. We can say that 20/x=55/100, because 55% is 55/100.

2. Simplify in which we can find x. Multiply x on both sides and multiply by 100 on both sides (or just cross multiply). You would get that 55x=2000, and if you divide by 55 on both sides, it would be x = 36.3636364, and since you can't have a fraction of a person, you round it to the nearest whole number.

There are 36 students in the class.

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