I get 5.6 This tells me that 15 is not a factor of 84.
5.6
15/560 - 100/84 = (15*3 -100*20)/1680 = (45-2000)/1680 = -1955/1680 = -391/336 or -1.164
When you divide 84 by 15 you get 5.6 it is saying that when you have the number that you are going to put another number into in this case the number is 84 if you are going to take a evn number an divide it by a odd number then you know that you are going to get a odd number that is why 84\15= 5.6.
84 divided by 2 is 42
84 divided by 1 is equal to 84.
64 divided into 84 = 0.7619047619047619
84 divided by 32= = 2.625
84
21
0.6269
84