Suppose you have a bag containing 30 marbles. If the probability of drawing a black marble is twice as likely not drawing a black marble, how many black marbles are in the bag?

Marion has a bicycle that she is planning to take for a ride. the rim of the rear wheel lies 41 cm from the center of the wheel. the tire itself has a thickness of 3 cm. in order for marion to ride her bicycle 96,712 cm approximately how many rotations will the rear wheel make?