0.1875
These equations are when the numbers are combined and sometimes divided. There are many more than simply 8 of these equations.
8 ÷ 15 = 8 over 15.
8
8
1.875
1.875
Your equations are not worded properly.
15.5
15
0.125
15 / (3/8) = 15*8/3 = 40
8/2 is 4 because 4 times 2 is 8