Answer:
17
Explanation:
To find the number of green beads that Felicia used, we first need to list out what we know.
Let x = number of green beads.
Yellow Beads = 153
So we get:
x*9 = 153
We divide both sides by nine to find the value of x.

x = 17
To see if we got the answer correct, let's substitute x.
x * 9 = 153
17 * 9 = 153
153 = 153