4. becuase to bake 48 cooking in a day she would have to bake for 4 hours at least.
12 wouldnt be right becuase she bakes 12 cookies every hour
60 wouldnt be right because the first day she cooked 48 cookies meaning she was baking for 4 hours
and 48 wouldnt be right because that is how many she bakes in 1 day.
