There are 9 steel pipes in the top layer and 16 steel pipes in the bottom layer. There are 8 layers in total. How many steel pipes are there in this pile?
一堆钢管，最上层9根，最下层16根，共有8层，这堆钢管共有多少根．
<gadget id="calculator">9 + 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>