There are 14 poplar trees in the school, the number of pine trees is twice that of poplar trees, and the number of willow trees is 4 less than that of pine trees. How many willow trees are there?
学校有14棵杨树，松树的棵数是杨树的2倍，柳树比松树少4棵，有多少棵柳树．
<gadget id="calculator">14 * 2</gadget>
<output>28</output>

<gadget id="calculator">28 - 4</gadget>
<output>24</output>

<result>24</result>