A cylindrical reservoir is 5m deep and has a volume of 400m**3. If it is dug to a depth of 0.5m, what is the volume of the pool in cubic meters?
一个圆柱形蓄水池，深5m，容积是400m**3，如果再挖深0.5m，水池容积是多少立方米？
<gadget id="calculator">400 / 5</gadget>
<output>80</output>

<gadget id="calculator">80 * 0.5</gadget>
<output>40</output>

<gadget id="calculator">40 + 400</gadget>
<output>440</output>

<result>440</result>