###Human: Nina made a two-layer cake and a dozen cupcakes for her friend’s birthday party. Each layer of cake takes the same amount of sugar to make as a dozen cupcakes. Nina used 720 grams of sugar to bake everything. How many grams of sugar are in one cupcake?, ### Assistant: Nina made 2 cake layers which were equal to 2 x 12 = 24 cupcakes.
She made the equivalent of 24 + 12 = 36 cupcakes in all.
Thus, there are 720 / 36 = 20 grams of sugar in a cupcake. 
 So the answer is :  20