.
I will assume that when she mix these dry ingredients, the volume of the mixture is equal to the sum
of the volumes of ingredients.
It is really an assumption, since it is NOT ALWAYS true for dry ingredients.
Under with assumption, the volume of the mixture is
cups =
=
cups.
Next, to determine the number of servings, we should divide this volume by one quantum volume of
of a cup.
We will obtain then the number of the servings as
=
= 5*4 = 20 servings. ANSWER
Learn how to add and divide fractions from my post (!)