A group of students is taking a CPR course. The total cost for the course is $275. The room in which the course will be held can hold a maximum of 25 people, including the instructor. What is the minimum number of students needed to take the course so that the cost per student will be less than $15?

A) 11
B) 17
C) 18
D) 19

Question

A group of students is taking a CPR course. The total cost for the course is $275. The room in which the course will be held can hold a maximum of 25 people, including the instructor. What is the minimum number of students needed to take the course so that the cost per student will be less than $15?  

A) 11
B) 17
C) 18
D) 19

bibby · Answer

You're dividing the 275 by the number of students (x) until you get some x that makes it < 15

As an inequality: 

275
---  <  15
  x

bibby · Answer

275/15 < x
18.3 < x

Now you have to ask yourself what 18.3  people even means. You can't have 0.3 of a person, right?

That means you have to move on to the next whole number, 19. You can check this by dividing 275/18 vs 275/19