Tom doesn't really want to give away blue marbles and would like to change the probability that he chooses a blue marble to 1/10.how many marbles that are not blue could he add to the bag so that the probability of choosing a blue marble becomes.

There are 1872 steps in a building that has 104 floors. each floor has the same number of steps. a second building has the same number of floors but 2 fewer steps between each floor. how many steps are there between each floor of the second building?