Question
Natalie had some mochi balls at first. After she gave away 3 mochi balls to her cousin and ate another 3 mochi balls, she went to buy another 40 mochi balls. In the end, she had thrice as many mochi balls as before. How many mochi balls did iris have at first?
4 m

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Natalie had some mochi balls at first. After she gave away 3 mochi balls to her cousin and ate another 3 mochi balls, she went to buy another 40 mochi balls. In the end, she had thrice as many mochi balls as before. How many mochi balls did iris have at first?