1. HARD

In a class, 20 students are girls, composing 40% of the class. What is the total number of students in the class?

  1. 20
  2. 30
  3. 50
  4. 60
  5. 70
 
2. HARD

In Mr.G's class, the ratio of boys to girls is 4:5. If 25% of the boys leave the class, what is the new ratio of boys to girls?

 
3. HARD

Ben answered 64 problems correctly on his history exam and received a grade 75%. How many problems were on the exam, if all the problems were worth the same number of points? (Round to the nearest whole number)

  1. 48
  2. 100
  3. 90
  4. 80
  5. 85