A rectangular iron sheet with a length of 30 cm and a width of 25 cm is cut off at each of the four corners to form a square with a side length of 5 cm, and it is welded into a rectangular parallelepiped box without a cover. What is the volume of this box?
一块长30厘米，宽25厘米的长方形铁皮，在四个角各剪去边长为5厘米的正方形，将它焊接成一个无盖的长方体盒子，这个盒子的体积是多少？
<gadget id="calculator">5 * 2</gadget>
<output>10</output>

<gadget id="calculator">30 - 10</gadget>
<output>20</output>

<gadget id="calculator">25 - 10</gadget>
<output>15</output>

<gadget id="calculator">20 * 15 * 5</gadget>
<output>1_500</output>

<result>1_500</result>