Xiaoqiao typed a manuscript, and had dinner after typing half of it. After dinner, she typed 28 more words per minute than before dinner. A total of 48 minutes were typed before and after, and 504 more characters were typed in the last 24 minutes than in the first 24 minutes. How many words are there in this manuscript?
小巧打一篇文稿，打完一半后吃晚饭，晚饭后每分钟比晚饭前每分钟多打28个字．前后共打字48分钟，后24分钟比前24分钟多打504个字．这篇文稿一共多少个字．
<gadget id="calculator">28 * 18</gadget>
<output>504</output>

<gadget id="calculator">30 - 18</gadget>
<output>12</output>

<gadget id="calculator">504 / 12</gadget>
<output>42</output>

<gadget id="calculator">42 * 30 * 2</gadget>
<output>2_520</output>

<result>2_520</result>