To celebrate New Year's Day, Uncle Gardener used 304 pots of Chinese roses to form a trapezoidal flower garden in the middle of the square in People's Park. There are 12 pots of roses on the top of the flower garden, and 26 pots on the bottom. How many floors does this trapezoidal flower garden have?
为了庆祝元旦，园丁叔叔用304盆月季花在人民公园的广场中间摆成了一个梯形的花圃，花圃的最顶层有12盆月季花，最底层有26盆，这个梯形花圃一共有多少层？
<gadget id="calculator">12 + 26</gadget>
<output>38</output>

<gadget id="calculator">2 / 38</gadget>
<output>1/19 = around 0.052632</output>

<gadget id="calculator">304 * (1/19)</gadget>
<output>16</output>

<result>16</result>