In a pile of cement pipes, 10, 9, 8, 7...5 pipes are piled up sequentially from top to bottom, with a total of 6 layers. How many cement pipes are there in this pile?
一堆水泥管，从上到下依次堆放10根、9根、8根、7根…5根，共6层，这堆水泥管有多少根？
<gadget id="calculator">10 + 5</gadget>
<output>15</output>

<gadget id="calculator">6 / 2</gadget>
<output>3</output>

<gadget id="calculator">15 * 3</gadget>
<output>45</output>

<result>45</result>