There are 18 pagoda trees in the school, every pagoda tree is poplar (3/4), and every camphor tree is pagoda tree (2/3). Based on the information above, ask a mathematical question and answer it?
学校有槐树18棵，槐树的棵树是杨树的(3/4)，樟树的棵树是槐树的棵树的(2/3)．根据以上信息提一个数学问题并解答？
<gadget id="calculator">2 / 3</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">18 * (2/3)</gadget>
<output>12</output>

<result>12</result>