Answer:
36 students
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.
Answer: There are 36 students in the class.