Sally made 3 cup. ana made twice as many cup as sally. how many cup did they make all ?

I find it easiest to put it into an equation first, that way it's not as confusing. 

3 + 3 x 2 =

First, we multiply. 

3 x 2 = 6

Now we add. 

6 + 3 = 9

So the answer is that they made 9 cups in all.