A cuboid fish tank is 20 decimeters long and 15 decimeters wide when measured from the inside, and the water depth of the bathtub is 100 centimeters. Put a stone into the water. The water level rises to 18 decimeters, what is the volume of the stone in cubic meters?
一个长方体的鱼缸，从里面量长是20分米，宽是15分米，浴缸的水深是100厘米，把一块石头放入水中．水面升到18分米，这块石头的体积是多少立方米？
<gadget id="calculator">100 / 10</gadget>
<output>10</output>

<gadget id="calculator">18 - 10</gadget>
<output>8</output>

<gadget id="calculator">8 / 1_000</gadget>
<output>1/125 = around 0.008</output>

<gadget id="calculator">20 * 15 * (1/125)</gadget>
<output>12/5 = around 2.4</output>

<result>12/5 = around 2.4</result>