Question
Mary had some chocolate bars. She sold 30% of her chocolate bars and gave half of the remainder to her cousin. After that, she bought 10 chocolate bars and had a total of 87 chocolate bars in the end. How many chocolate bars did Mary have at first?
4 m

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Mary had some chocolate bars. She sold 30% of her chocolate bars and gave half of the remainder to her cousin. After that, she bought 10 chocolate bars and had a total of 87 chocolate bars in the end. How many chocolate bars did Mary have at first?