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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?

10 red

3 red

5 red

2 red

Question

19 July, 09:06

+3

Answers (1)

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Braedon Bradley · Answer 1

Originally, there were

x = 5 red

4x = 20 blue

Now, there are

x+5 = 10 red

4x = 20 blue