4 second-grade teachers take 20 students to row a boat, and each boat can accommodate 4 people. How many boats should I rent?
二年级4位老师带着20名学生去划船，每条船上可乘坐4人．应该租几条船？
<gadget id="calculator">20 + 4</gadget>
<output>24</output>

<gadget id="calculator">24 / 4</gadget>
<output>6</output>

<result>6</result>