is smooth.
spoon the batter into the doughnut molds. bake for 20 to 24 minutes, until lightly golden brown around the edges.
the doughnuts should feel a bit soft. let cool in pan for 5 minutes and then place on a cooling rack and allow to cool for 5 minutes.
once cool to the touch, roll them in the cinnamon sugar mixture. function, called mcnuggets that takes one argument, n, and returns true if it is possible to buy a combination of 6, 9 and 20 pack units such that the total number of mcnuggets equals n, and otherwise returns false. hint: use a guess and check approach. 