A piece of cuboid cardboard is 30cm long and 25cm wide. Cut off a square with a side length of 5cm at each of its four corners and fold it into a carton without a cover. What is the volume of the carton?
一张长方体纸板长30cm，宽25cm，在它的四角各剪去边长是5cm的正方形，折成一个无盖的纸盒，这个纸盒的体积是多少？
<gadget id="calculator">30 - 5 - 5</gadget>
<output>20</output>

<gadget id="calculator">25 - 5 - 5</gadget>
<output>15</output>

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

<result>1_500</result>