A trapezoid is made of logs, with 4 logs on the top layer and 8 logs on the bottom layer. There are 24 logs in total. How many layers are piled up?
一个由圆木堆成的梯形，顶层有4根，底层有8根，一共有24根，堆了多少层．
<gadget id="calculator">4 + 8</gadget>
<output>12</output>

<gadget id="calculator">2 / 12</gadget>
<output>1/6 = around 0.166667</output>

<gadget id="calculator">24 * (1/6)</gadget>
<output>4</output>

<result>4</result>