Question
Ian gave 211 of his cards to Japheth, 311 of his cards to Andy and 211 of his cards to Mark. He then had 20 cards left. How many cards had he at first?
4 m

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Ian gave 211 of his cards to Japheth, 311 of his cards to Andy and 211 of his cards to Mark. He then had 20 cards left. How many cards had he at first?