A rockery is placed in a cuboid fish tank with a bottom area of 51 square decimeters, and the water level rises by 3 cm. What is the volume of this rockery in cubic decimeters?
一个底面积为51平方分米的长方体鱼缸里放了一个假山石，水面上升了3cm．这个假山石的体积是多少立方分米．
<gadget id="calculator">3 / 10</gadget>
<output>3/10 = around 0.3</output>

<gadget id="calculator">51 * (3/10)</gadget>
<output>153/10 = around 15.3</output>

<result>153/10 = around 15.3</result>