Question
Risa and Jade had an equal number of erasers at first. After Risa gave 9 erasers to Jade, Jade had 20 erasers. How many erasers does Risa have in the end?
4 m

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Risa and Jade had an equal number of erasers at first. After Risa gave 9 erasers to Jade, Jade had 20 erasers. How many erasers does Risa have in the end?