A cube water tank has a length of 40 cm and a width of 35 cm when measured from the inside. A steel ball is immersed in the tank, and the water depth is 15 cm. When the steel ball is taken out, the water depth is 12 cm. What is the volume of the steel ball in cubic centimeters?
一个正方体的水箱，从里面量长是40厘米，宽是35厘米，水箱中浸没一个钢球，水深是15厘米，当取出钢球后，水深是12厘米．请问钢球的体积是多少立方厘米？
<gadget id="calculator">15 - 12</gadget>
<output>3</output>

<gadget id="calculator">40 * 35 * 3</gadget>
<output>4_200</output>

<result>4_200</result>