A cuboid water tank is 10 decimeters long, 8 decimeters wide and 45 centimeters deep. When a stone is submerged in the tank, the water level rises to 60 centimeters. What is the volume of this rock?
一个长方体水箱，长10分米，宽8分米，水深45厘米，当把一块石块放入水箱浸没后，水位上升到60厘米．这块石块的体积是多少？
<gadget id="calculator">60 / 10</gadget>
<output>6</output>

<gadget id="calculator">45 / 10</gadget>
<output>9/2 = around 4.5</output>

<gadget id="calculator">6 - (9/2)</gadget>
<output>3/2 = around 1.5</output>

<gadget id="calculator">10 * 8 * (3/2)</gadget>
<output>120</output>

<result>120</result>