Answer: 12 cupcakes have vanilla icing.
Explanation:
We know that Joakim is icing a total number of 30 cupcakes.
According to the exercise, Joakim spreads mint icing on
of the cupcakes.
Let be "m" the number of cupcakes that have mint icing. Then
He spreads chocolate on
of the remaining. The remaining is:
Let be "c" the number of cupcakes that have chocolate. Then
Let be "v" the number of cupcakes that have vanilla icing.
Since the rest will get vanilla icing, we know that: