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Mathematics 17 Online
OpenStudy (lolacole12):

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?

OpenStudy (anonymous):

Refer to the attachment using Mathematica.

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