Question
Opal had 84 more pens than Penelope at first. Penelope gave 20 of her pens to Opal. Opal now has 3 times as many pens as Penelope. How many pens did Penelope have at first?
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Opal had 84 more pens than Penelope at first. Penelope gave 20 of her pens to Opal. Opal now has 3 times as many pens as Penelope. How many pens did Penelope have at first?