Put a piece of iron and 15 liters of water together into a glass tank with a length of 4 decimeters, a width of 2 decimeters, and a height of 3 decimeters. At this time, the water surface is 2 decimeters high. What is the volume of this piece of iron?
将一块铁和15升水一起放入一个长4分米，宽2分米，高3分米的玻璃缸里这时的水面高2分米，这块铁块的体积是多少？
<gadget id="calculator">4 * 2</gadget>
<output>8</output>

<gadget id="calculator">15 / 8</gadget>
<output>15/8 = around 1.875</output>

<gadget id="calculator">2 - (15/8)</gadget>
<output>1/8 = around 0.125</output>

<gadget id="calculator">(1/8) * 4 * 2</gadget>
<output>1</output>

<result>1</result>