Today at school, Aileen spent 6 hours in classes, 0.5 hour in lunch, and 2 hours practicing soccer. About what percent of Aileen's time at school was spent in classes?

The number if marbles of different colors stored in a hat is listed below: 4 red marbles 10 green marbles 7 blue marbles. without looking in the hat, dan takes out a marble at random. he replaces the marble and then takes out another marble from the hat. what is the probability that dan takes out a blue marble in both draws?