If a watermelon is submerged in a cuboid container with a bottom area of 15dm**2, the water level rises by 2 cm, what is the volume of the watermelon in dm**3.
把一个西瓜浸没到底面积是15dm**2的长方体容器中，水面上升了2厘米，这个西瓜的体积是多少dm**3．
<gadget id="calculator">2 / 10</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">15 * (1/5)</gadget>
<output>3</output>

<result>3</result>