A cube tank with a side length of 8 decimeters, measures the water depth of 4 decimeters from the inside, and puts a pebble into the water. At this time, the measured water depth is 60 centimeters. What is the volume of the pebble in cubic decimeters?
一个正方体水槽，棱长8分米，从里面量水深4分米，把一个鹅卵石放入水中，这时量的水深60厘米，鹅卵石的体积是多少立方分米？
<gadget id="calculator">60 / 10</gadget>
<output>6</output>

<gadget id="calculator">6 - 4</gadget>
<output>2</output>

<gadget id="calculator">8 * 8 * 2</gadget>
<output>128</output>

<result>128</result>