18 students in a class can plant 150 trees. If 225 trees are to be planted, how many students are needed?
某班同学18个人可以植树150棵，如果要植树225棵，还需要派多少个同学？
<gadget id="calculator">225 - 150</gadget>
<output>75</output>

<gadget id="calculator">150 / 18</gadget>
<output>25/3 = around 8.333333</output>

<gadget id="calculator">75 / (25/3)</gadget>
<output>9</output>

<result>9</result>