There are a pile of steel pipes, the top layer is 6, the bottom layer is 10, a total of 5 layers. How many steel pipes are there in this pile?
有一堆钢管，最上层是6根，最下层是10根，一共5层．这堆钢管有多少根．
<gadget id="calculator">6 + 10</gadget>
<output>16</output>

<gadget id="calculator">5 / 2</gadget>
<output>5/2 = around 2.5</output>

<gadget id="calculator">16 * (5/2)</gadget>
<output>40</output>

<result>40</result>