A stone is placed in a tank of (3/10) meters long and (1/5) meters wide, and the water level rises by (1/30) meters. What is the volume of this stone?
在一个长(3/10)米、宽(1/5)米的水缸里放入一块石头，水面升高了(1/30)米．这块石头的体积是多少？
<gadget id="calculator">3 / 10</gadget>
<output>3/10 = around 0.3</output>

<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">1 / 30</gadget>
<output>1/30 = around 0.033333</output>

<gadget id="calculator">(3/10) * (1/5) * (1/30)</gadget>
<output>1/500 = around 0.002</output>

<result>1/500 = around 0.002</result>