Dr. banks had 330 toothbrushes to give away to his patients.
he gave away 53 toothbrushes in january. he gave away 67
toothbrushes in february. in march he gave away 46
toothbrushes. how many toothbrushes does he have left?

Over the course of the school year, you keep track of how much snow falls on a given day and whether it was a snow day. your data indicates that of twenty-one days with less than three inches of snow, five were snow days, while of the eight days with more than three inches of snow, six were snow days. if all you know about a day is that it is snowing, what is the probability that it will be a snow day?