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?
Nina made 2 cake layers which were equal to 2 x 12 = 
<gadget id="calculator">2*12</gadget>
<output>24</output>
24 cupcakes.
She made the equivalent of 24 + 12 = 
<gadget id="calculator">24+12</gadget>
<output>36</output>
36 cupcakes in all.
Thus, there are 720 / 36 = 
<gadget id="calculator">720/36</gadget>
<output>20</output>
20 grams of sugar in a cupcake.

<result>20</result>