A bag contains only red and blue marbles. Yasmine takes one marble at random from the bag. The probability that she takes a red
marble is 1 in 5. Yasmine returns the marble to the bag and adds five more red marbles to the bag. The probability that she takes one red marble at random is now 1 in 3. How many red marbles were originally in the bag?
There was one red marble because it said that the probability of choosing a red marble is 1/5 so the other marbles are blue. <span>Hope this helps. </span>
