A cylindrical sand pile has a bottom area of 15 square meters and a height of 2 meters. If this pile of sand is used to pave a road with a thickness of 1 decimeter on a road 20 meters wide, how many meters can it be paved with?
一个圆柱形沙堆，底面积是15平方米，高是2米，用这堆沙在20米宽的公路上铺1分米厚的路面，能铺多少米长？
<gadget id="calculator">1 / 10</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">2 / 20 / (1/10)</gadget>
<output>1</output>

<gadget id="calculator">15 * 1</gadget>
<output>15</output>

<result>15</result>