A rectangular glass cylinder is 50 cm long, 30 cm wide, and 12 cm deep. A machine part is submerged in the water. At this time, the height of the water surface is 15 cm. Find the volume of the part.
一个长方形玻璃缸，从里面量长50厘米，宽30厘米，水深12厘米，把一个机器零件浸没在水中，这时水面高度15厘米，求零件的体积．
<gadget id="calculator">15 - 12</gadget>
<output>3</output>

<gadget id="calculator">50 * 30 * 3</gadget>
<output>4_500</output>

<result>4_500</result>