Teacher Li has 2,300 words to type for an article, and he has already typed 1,700 words. If the rest is to be completed in 4 minutes, how many words will be typed per minute on average?
李老师要打一篇有2300字，已经打了1700个，剩下的如果要在4分钟里完成，平均每分钟要打多少个字？
<gadget id="calculator">2_300 - 1_700</gadget>
<output>600</output>

<gadget id="calculator">600 / 4</gadget>
<output>150</output>

<result>150</result>