In a pile of steel pipes, there are 8 steel pipes in the bottom layer and 2 steel pipes in the uppermost layer. The difference between each two adjacent layers is 1 steel pipe. How many steel pipes are there in total in this pile?
一堆钢管，最下层有8根，最上层有2根，每相邻两层都相差1根，这堆钢管共有多少根．
<gadget id="calculator">2 + 8</gadget>
<output>10</output>

<gadget id="calculator">8 - 2</gadget>
<output>6</output>

<gadget id="calculator">6 + 1</gadget>
<output>7</output>

<gadget id="calculator">7 / 2</gadget>
<output>7/2 = around 3.5</output>

<gadget id="calculator">10 * (7/2)</gadget>
<output>35</output>

<result>35</result>