Take a cuboid block with a length of 1m and form two cuboids along its length. The surface area is increased by 60dm**2, what is the volume of the rectangle dm**2.
把一个长为1m的长方体木块，沿长踞成两个长方体．表面积增加了60dm**2，这个长方形的体积是多少dm**2．
<gadget id="calculator">60 / 2</gadget>
<output>30</output>

<gadget id="calculator">30 * 1 * 10</gadget>
<output>300</output>

<result>300</result>