The edge length of a cube goldfish tank is 2dm, and there is 5L of water in the tank. A piece of coral stone is put into the water, and the depth of the water in the tank is 15cm. What is the volume of this coral stone?
一个正方体金鱼缸的棱长是2dm，鱼缸内装有5L水，把一块珊瑚石放入水中，这时量得鱼缸内水深15cm．这块珊瑚石的体积是多少？
<gadget id="calculator">15 / 10</gadget>
<output>3/2 = around 1.5</output>

<gadget id="calculator">2 * 2</gadget>
<output>4</output>

<gadget id="calculator">5 / 4</gadget>
<output>5/4 = around 1.25</output>

<gadget id="calculator">(3/2) - (5/4)</gadget>
<output>1/4 = around 0.25</output>

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

<result>1</result>