I believe the answer is 180. When you set up a proportion, you put percentages over 100, and is over of. In this context, the 'is' would be the total number of students, and the 'of' is the number of students that voted. So your proportion should be 99 over x (representing the total number of students) equals 55 over 100. You cross multiply, 100 times 99= 9900. You divide 9900 by 55 to get x. X=180.