Physicist use models to work out the pressure inside an aeroplane. the length of a model aeroplane is 16cm and the length of the real aeroplane is 60m. work out the ratios of the length of the model to the real aeroplane.

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?