I don't know how to get the right answer. I know that the probability of selecting a red marble from the mayonnaise jar is 6/10. There are two possibilities of selecting a red marble from the jelly jar. If the first selection is red, the probability is 3/8, otherwise, the probability is 2/8.
A mayonnaise jar contains 6 red marbles and 4 blue marbles. A jelly jar contains 2 red marbles and 5 blue marbles. One marble is randomly selected from the mayonnaise jar and placed in the jelly jar. A marble is then randomly selected from the jelly jar. What is the probability that the selected marble is red? Express your answer as a common fraction.