15
Write "9" then the forward slash "/" and then "15". Or you can write the 9 above a horizontal line with the 15 below that line.
You write it as 3/15. However, that can be simplified to 1/5.
you do 15 * 15 * 15
15%
15 = quinze
15/100 = 0.15 = 15%
4/15
150%
.15
N + 15
It is X <= 15.