A cuboid water tank with a length of 80cm, a width of 45cm, and a height of 40cm contains 10 lead balls (completely submerged). What is the volume of each lead ball?
一个长80cm、宽45cm、高40cm的长方体水箱里放着10个铅球(完全浸没)，现在水面高25cm，把10个铁铅拿出后，水面降到21cm．每个铅球的体积是多少？
<gadget id="calculator">25 - 21</gadget>
<output>4</output>

<gadget id="calculator">4 / 10</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">80 * 45 * (2/5)</gadget>
<output>1_440</output>

<result>1_440</result>