A cuboid fish tank with a length of 20 cm and a width of 15 cm has a water depth of 6 cm. After putting 2 identical steel balls (the water completely submerges the steel balls), the water depth rises to 10 cm. What is the volume of each steel ball in cubic centimeters?
一个长20厘米，宽15厘米的长方体鱼缸，水深6厘米，放入2颗一样的钢珠后(水完全浸没钢珠)，水深上升到10厘米，每颗钢珠的体积是多少立方厘米？
<gadget id="calculator">10 - 6</gadget>
<output>4</output>

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

<gadget id="calculator">20 * 15 * 2</gadget>
<output>600</output>

<result>600</result>