There are 8 water pipes in the upper layer and 18 in the lower layer of a pile of water pipes. There are 5 layers in total. How many water pipes are there in this pile?
一堆水管上层放8根，下层放18根，共放5层，这堆水管共有多少根．
<gadget id="calculator">8 + 18</gadget>
<output>26</output>

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

<gadget id="calculator">26 * (5/2)</gadget>
<output>65</output>

<result>65</result>