180537.5 what is it simplified??

2) 20 students

4) 28 students

Question 2 is 25% - but it's asking how many. If you know the total number of students multiply that times .25 and that number is your answer. So .25 x 80 = 20

Question 4 is 35% also multiplied times the total number of students. So it would be the total number of students multiplied times .35.

So .35 x 80 = 28

Both of these questions want the number of students, not the percent.