A cylindrical water storage bucket has a bottom circumference of 12.56 decimeters and a height of 3 decimeters. A bucket full of water is poured into another cuboid tank, and the cuboid tank is still 21.5% empty. It is known that the length of the cuboid pool is 6 decimeters, and the length is twice the width. How many decimeters is the height of the pool?
某圆柱形贮水桶，底面周长12.56分米，高3分米，盛满一桶水，把它倒入另一长方体水池后，长方体水池里还空着21.5%．已知长方体水池长6分米，长是宽的2倍，求水池的高是多少分米？
<gadget id="calculator">12.56 / 3.14 / 2</gadget>
<output>2</output>

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

<gadget id="calculator">21.5 / 100</gadget>
<output>0.215</output>

<gadget id="calculator">1 - 0.215</gadget>
<output>0.785</output>

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

<gadget id="calculator">6 * 3</gadget>
<output>18</output>

<gadget id="calculator">6 / 2 / 0.785 / 18</gadget>
<output>0.212314</output>

<gadget id="calculator">3.14 * 4 * 0.212314</gadget>
<output>2.666664</output>

<result>2.666664</result>