A cuboid pool is 20 meters long, 12 meters wide, and 2.5 meters deep. Put cement on the four walls and the ground of the pool, how many square meters is the area where the cement is applied?
一个长方体水池，长20米，宽12米，深2.5米．在水池四壁和地面抹上水泥，抹水泥的面积是多少平方米？
<gadget id="calculator">20 * 12</gadget>
<output>240</output>

<gadget id="calculator">20 * 2.5 * 2</gadget>
<output>100</output>

<gadget id="calculator">12 * 2.5 * 2</gadget>
<output>60</output>

<gadget id="calculator">240 + 100 + 60</gadget>
<output>400</output>

<result>400</result>