At a bake sale there were 72 raisin cookies sold if the ratio of raisin cookies so to the oatmeal cookies sold was 9 to 1 what is the combined amount of raisins and oatmeal cookies sold?

The combined amount of raisins and oatmeal cookies sold are 80.

Step-by-step 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.

12

Step-by-step explanation:

The fundamental counting principle states that to find the total number of combinations, we multiply the choices for each element.

She can choose between 2 types of pillows; 2 types of sheets; and 3 types of comforters.  This gives us

2(2)(3) = 4(3) = 12