Uncle Li entered a manuscript. He first entered 150 characters in 3 minutes, and then finished the rest at the same speed in 10 minutes. How many characters are in this manuscript?
李叔叔录入一份稿件，他先用3分钟录入了150个字，剩下的他又用同样的速度10分钟录完，这份稿件有多少个字？
<gadget id="calculator">150 / 3</gadget>
<output>50</output>

<gadget id="calculator">3 + 10</gadget>
<output>13</output>

<gadget id="calculator">50 * 13</gadget>
<output>650</output>

<result>650</result>