cuboid pool is 30 meters long, 20 meters wide, and 3 meters high. Now the depth of the water is 2.5 meters, if it is filled with water, how many cubic meters will the volume of the water increase?
一个长方体水池，长30米，宽20米，高3米．现在水深2.5米，如果加满水，水的体积会增加多少立方米？
<gadget id="calculator">3 - 2.5</gadget>
<output>0.5</output>

<gadget id="calculator">30 * 20 * 0.5</gadget>
<output>300</output>

<result>300</result>