A cuboid iron box without a lid has a length of 25cm, a width of 12cm, and a height of 10cm. If a layer of paint is painted on its shell, how many square centimeters is the painted area?
一个无盖长方体铁盒长25cm，宽12cm，高10cm，如果在它的外壳涂一层油漆，涂油漆的面积是多少平方厘米？
<gadget id="calculator">25 * 12</gadget>
<output>300</output>

<gadget id="calculator">25 * 10 * 2</gadget>
<output>500</output>

<gadget id="calculator">12 * 10 * 2</gadget>
<output>240</output>

<gadget id="calculator">300 + 500 + 240</gadget>
<output>1_040</output>

<result>1_040</result>