Question
Mary had 4 times as many cards as Opal at first. After Mary gave 21 cards to Opal, they each had the same number of cards in the end. How many cards did Opal have in the end?
3 m

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Mary had 4 times as many cards as Opal at first. After Mary gave 21 cards to Opal, they each had the same number of cards in the end. How many cards did Opal have in the end?