The first part of the question gives you the proportion of flour to milk to use.
It 6 to 1 1/6 of flour to milk.
Let's start by rewriting the mixed fraction into a fraction.
1 and 1/6 means:
Now, we know the proportion is 6 to 7/6.
To get the amount of milk for 2 cups of flour, notice that we divided the original amount of flour by 3, because 6/3 = 2.
To maintain the proportion of flour to milk, we need to divide the amount of milk by 3 too:
So, the amount of milk for 2 cups of flour is 7/18 cups.