In a pile of steel pipes, there are 16 steel pipes in the bottom layer, and the number of steel pipes decreases by 1 for each additional layer, making a total of 8 layers. How many steel pipes are there in total?
一堆钢管，最下面一层有16根，每增加一层根数就减少1根，一共堆了8层．这堆钢管一共有多少根？
<gadget id="calculator">16 - 8</gadget>
<output>8</output>

<gadget id="calculator">8 + 1 + 16</gadget>
<output>25</output>

<gadget id="calculator">8 / 2</gadget>
<output>4</output>

<gadget id="calculator">25 * 4</gadget>
<output>100</output>

<result>100</result>