The cross-section of a cuboid is a square with a perimeter of 20 cm and the sum of the areas of its four sides is 300 cm2. What is its volume?
一个长方体的横截面是周长为20厘米的正方形，四个侧面的面积和是300平方厘米，它的体积是多少．
<gadget id="calculator">20 / 4</gadget>
<output>5</output>

<gadget id="calculator">300 / 20</gadget>
<output>15</output>

<gadget id="calculator">5 * 5 * 15</gadget>
<output>375</output>

<result>375</result>