Answer:
The combined amount of raisins and oatmeal cookies sold are 80.
Explanation:
At a bake sale there were 72 raisin cookies sold.
The ratio of raisin cookies to the oatmeal cookies sold was 9:1
Let the oatmeal cookies be = x
We get the following relation:

=>

x = 8
So there were 8 oatmeal cookies sold.
And the combined total is =

Hence, the combined amount of raisins and oatmeal cookies sold are 80.