There is a pile of wood, and Xiao Ming counts 21 pieces on the bottom layer, one piece less than the next level on each level, and 11 pieces on the top level. How many pieces of wood are there in this pile?
有一堆木料，小明数了数最底层有21根，每向上一层都比其下一层少一根，最上面一层11根．这堆木料共有多少根？
<gadget id="calculator">11 + 21</gadget>
<output>32</output>

<gadget id="calculator">21 - 11</gadget>
<output>10</output>

<gadget id="calculator">10 + 1</gadget>
<output>11</output>

<gadget id="calculator">11 / 2</gadget>
<output>11/2 = around 5.5</output>

<gadget id="calculator">32 * (11/2)</gadget>
<output>176</output>

<result>176</result>