Matty is always on the playground his favorite coins to collect or nickels and dimes. He has found $6.20, or $72 total nickels and dimes. Write and algebraically solve a system of equations to figure out how many nickels he has and how many dimes he has.

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?