Question
Risa had 4 times as many pens as Irene at first. After Risa gave 39 pens to Irene, they each had the same number of pens in the end. How many pens did Risa have at first?
3 m

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Risa had 4 times as many pens as Irene at first. After Risa gave 39 pens to Irene, they each had the same number of pens in the end. How many pens did Risa have at first?