A cylindrical grain hoard filled with wheat has a bottom area of 3.5 square meters and a height of 1.8 meters. If the wheat is piled into a conical pile with a height of 1.5 meters, how many square meters does it cover?
一个装满小麦的圆柱形粮囤，底面积是3.5平方米，高是1.8米．如果把这些小麦堆成高是1.5米的圆锥形麦堆，占地面积是多少平方米？
<gadget id="calculator">3.5 * 1.8</gadget>
<output>6.3</output>

<gadget id="calculator">3 / 1.5</gadget>
<output>2</output>

<gadget id="calculator">6.3 * 2</gadget>
<output>12.6</output>

<result>12.6</result>