Question
Sean gave 111 of his stamps to Ivan, 111 of his stamps to Gabriel and 311 of his stamps to Japheth. He then had 18 stamps left. How many stamps had he at first?
4 m

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Sean gave 111 of his stamps to Ivan, 111 of his stamps to Gabriel and 311 of his stamps to Japheth. He then had 18 stamps left. How many stamps had he at first?