Question
Ken gave 17 of his marbles to Billy, 37 of his marbles to Fabian and 17 of his marbles to Dylan. He then had 12 marbles left. How many marbles had he at first?
4 m

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Ken gave 17 of his marbles to Billy, 37 of his marbles to Fabian and 17 of his marbles to Dylan. He then had 12 marbles left. How many marbles had he at first?