A cylindrical oil drum has a volume of 62.8 cubic decimeters and a base radius of 20 centimeters. There is a barrel of oil inside, how many decimeters is the oil level high?
一个圆柱形油桶的容积62.8立方分米，底面半径是20厘米．里面装了桶油，油面高多少分米？
<gadget id="calculator">20 / 10</gadget>
<output>2</output>

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

<gadget id="calculator">3.14 * 4</gadget>
<output>12.56</output>

<gadget id="calculator">62.8 / 12.56</gadget>
<output>5</output>

<result>5</result>