Question
Simon gave 17 of his cards to Oscar, 37 of his cards to Howard and 17 of his cards to Sean. He then had 20 cards left. How many cards had he at first?
4 m

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Simon gave 17 of his cards to Oscar, 37 of his cards to Howard and 17 of his cards to Sean. He then had 20 cards left. How many cards had he at first?