Xiao Zhang can type 125 characters per minute on average. It took him 24 minutes to type an article, and there are still 450 characters left to type. How many words are there in this article?
小张平均每分钟能打125个字，他打一篇文章已经用了24分钟，还剩450个字没有打，这篇文章共有多少个字？
<gadget id="calculator">125 * 24</gadget>
<output>3_000</output>

<gadget id="calculator">3_000 + 450</gadget>
<output>3_450</output>

<result>3_450</result>