The sum of the ages of father and his son is 40 yrs .If they both live on till the son becomes as old as father is now , the sum of their ages will be 96 yrs. find their present ages .

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?