If two identical cubes are used to form a cuboid, the sum of the lengths of the sides is reduced by 40 cm. Find the surface area of the cuboid.
用2个完全一样的正方体拼成一个长方体，棱长总和一共减少了40厘米，求这个长方体的表面积．
<gadget id="calculator">40 / 8</gadget>
<output>5</output>

<gadget id="calculator">5 * 5 * 6 * 2</gadget>
<output>300</output>

<gadget id="calculator">5 * 5 * 2</gadget>
<output>50</output>

<gadget id="calculator">300 - 50</gadget>
<output>250</output>

<result>250</result>