Ashopkeeper had 15m cloth. he sold 2/5 part of it to a customer and 1/3 part of it to another. how much cloth is left with him now?

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?