Question
Yen had 4 times as many buttons as Sarah at first. After Yen gave 15 buttons to Sarah, they each had the same number of buttons in the end. How many buttons did Yen have at first?
3 m

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Yen had 4 times as many buttons as Sarah at first. After Yen gave 15 buttons to Sarah, they each had the same number of buttons in the end. How many buttons did Yen have at first?