The inside of a wine bottle is 30 cm deep, the inner diameter of the bottom surface is 10 cm, and the height of the wine in the bottle is 15 cm. After the mouth of the wine bottle is plugged tightly, the bottle mouth is turned upside down. At this time, the height of the wine is 25 cm. What is the volume?
一个酒瓶里面深30厘米，底面内直径是10厘米，瓶里酒的高度是15厘米，把酒瓶口塞紧后使其瓶口向下倒立，这时酒的高度是25厘米，酒瓶的容积是多少？
<gadget id="calculator">10 / 2</gadget>
<output>5</output>

<gadget id="calculator">5 ** 2</gadget>
<output>25</output>

<gadget id="calculator">30 - 25</gadget>
<output>5</output>

<gadget id="calculator">5 + 15</gadget>
<output>20</output>

<gadget id="calculator">3.14 * 25 * 20</gadget>
<output>1_570</output>

<result>1_570</result>