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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?

Respuesta :

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. 
Hope this helps. 
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