The teacher writes 36 words per minute. Students write 27 characters per minute, and they write together for 7 minutes. How many characters are they writing in total?
老师每分钟写36个字．学生每分钟写27个字，他们共同写7分钟，一共写多少个字？
<gadget id="calculator">36 + 27</gadget>
<output>63</output>

<gadget id="calculator">63 * 7</gadget>
<output>441</output>

<result>441</result>