Cual es el minimo comu multiplo de 81,27,9

The perimeter of a movie screen is 54 meters. the screen is 18 meters wide. how tall is it?

If the scale factor between two circles is 2x/5y what is the ratio of their areas?

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?