1 = 6 out of 15
2 = 4 out of 15
3 = 5 out of 15
4 = 11 out of 15
hope this helps you
Answer:

Step-by-step explanation:
-Greatest common factor is defined as the greatest positive that divides a set of whole numbers evenly and without a remainder.
-Given the set 
we notice, that the GCF can't be an integer with the power of x greater than 2:

Since, there's no other positive integer than can evenly divide the set of quotients, the GCF is 
Answer:
C
Step-by-step explanation:
5/2=15=6=2.5
Answer:
40 7th Graders
Step-by-step explanation:
First you add all of the students to get 25. Then you divide 100 by 25 to get 4 (this is gonna be your multiplier) now multiply each part of the ration by 4, and you get 60 6th graders and 40 7th graders :D.