Question
Shiyun had 31 more pens than Diana at first. Diana gave 10 of her pens to Shiyun. Shiyun now has 4 times as many pens as Diana. How many pens did Diana have at first?
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Shiyun had 31 more pens than Diana at first. Diana gave 10 of her pens to Shiyun. Shiyun now has 4 times as many pens as Diana. How many pens did Diana have at first?