There is a cylindrical cistern filled with water. The circumference of the bottom surface is 62.8 meters. After part of the water is used up, the water level drops 60 centimeters compared to when it is full, and the remaining water is exactly (4/7) of the volume of the cistern. This What is the volume of the pool?
有一个注满水的圆柱形蓄水池，底面周长62.8米，用去部分水后，水面比注满时下降60厘米，剩下的水正好是这个水池容积的(4/7)，这个水池的容积是多少？
<gadget id="calculator">62.8 / 3.14 / 2</gadget>
<output>10</output>

<gadget id="calculator">10 ** 2</gadget>
<output>100</output>

<gadget id="calculator">4 / 7</gadget>
<output>4/7 = around 0.571429</output>

<gadget id="calculator">1 - (4/7)</gadget>
<output>3/7 = around 0.428571</output>

<gadget id="calculator">60 / (3/7) / 100</gadget>
<output>7/5 = around 1.4</output>

<gadget id="calculator">3.14 * 100 * (7/5)</gadget>
<output>439.6</output>

<result>439.6</result>