Question
Marion had some chocolate bars at first. After she gave away 4 chocolate bars to her brother and ate another 5 chocolate bars, she went to buy another 57 chocolate bars. In the end, she had four times as many chocolate bars as before. How many chocolate bars did iris have at first?
4 m

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Marion had some chocolate bars at first. After she gave away 4 chocolate bars to her brother and ate another 5 chocolate bars, she went to buy another 57 chocolate bars. In the end, she had four times as many chocolate bars as before. How many chocolate bars did iris have at first?