cuboid has a length of 25 cm, a width of 30 cm, and a height of 15 cm. What is the surface area?
一个长方体，长是25厘米，宽是30厘米，高是15厘米，表面积是多少？
<gadget id="calculator">25 * 30</gadget>
<output>750</output>

<gadget id="calculator">25 * 15</gadget>
<output>375</output>

<gadget id="calculator">30 * 15</gadget>
<output>450</output>

<gadget id="calculator">750 + 375 + 450</gadget>
<output>1_575</output>

<gadget id="calculator">1_575 * 2</gadget>
<output>3_150</output>

<result>3_150</result>