Question
Sarah had some mochi balls. She sold 70% of her mochi balls and gave half of the remainder to her cousin. After that, she bought 24 mochi balls and had a total of 54 mochi balls in the end. How many mochi balls did Sarah have at first?
4 m

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Sarah had some mochi balls. She sold 70% of her mochi balls and gave half of the remainder to her cousin. After that, she bought 24 mochi balls and had a total of 54 mochi balls in the end. How many mochi balls did Sarah have at first?