Mom bought a tortoise and put it in a cuboid glass fish tank with a length of 5dm and a width of 4dm. After the tortoise completely sank into the water, the water surface rose by 1cm. Do you know the size of this turtle?
妈妈买来一只乌龟，放入长5dm，宽4dm的长方体玻璃鱼缸中，乌龟完全沉入水中后，观察水面上升了1cm．你知道这只乌龟的体积吗？
<gadget id="calculator">1 / 10</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">5 * 4 * (1/10)</gadget>
<output>2</output>

<result>2</result>