The young pioneers need to plant 726 trees, and 126 have already been planted. If the remaining 20 trees are planted every day, how many days will they have to plant?
少先队员要种726棵树，已经种了126棵，剩下的如果每天种20棵，还要种几天？
<gadget id="calculator">726 - 126</gadget>
<output>600</output>

<gadget id="calculator">600 / 20</gadget>
<output>30</output>

<result>30</result>