A cuboid swimming pool is 50 meters long, 30 meters wide and 2.5 meters deep. Put tiles around the swimming pool, how many square meters is the tiled area?
一个长方体游泳池，长50米，宽30米，深2.5米．给游泳池四周贴上瓷砖，贴瓷砖的面积是多少平方米？
<gadget id="calculator">50 * 2.5</gadget>
<output>125</output>

<gadget id="calculator">30 * 2.5</gadget>
<output>75</output>

<gadget id="calculator">125 + 75</gadget>
<output>200</output>

<gadget id="calculator">200 * 2</gadget>
<output>400</output>

<result>400</result>