Prephub - A deck of cards has only red cards and black cards The probability of a randomly chosen card being red is frac13 When 4 black cards are added to the deck the probability of choosing red becomes frac14 How many cards were in the deck originally

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A deck of cards has only red cards and black cards. The probability of a randomly chosen card being red is $\frac{1}{3}$ . When 4 black cards are added to the deck, the probability of choosing red becomes $\frac{1}{4}$ . How many cards were in the deck originally?

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