Question
Olivia had some mochi balls. She sold 30% of her mochi balls and gave half of the remainder to her brother. After that, she bought 47 mochi balls and had a total of 124 mochi balls in the end. How many mochi balls did Olivia have at first?
4 m

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Olivia had some mochi balls. She sold 30% of her mochi balls and gave half of the remainder to her brother. After that, she bought 47 mochi balls and had a total of 124 mochi balls in the end. How many mochi balls did Olivia have at first?