A cuboid glass container measures 4 decimeters in length, 3 decimeters in width and 5 decimeters in height. Pour 28.5L of water into the container, and then put an iron block into the water, which means the water depth in the container is 35 cm. What is the volume of this iron block?
一个长方体玻璃容器，从里面量长4分米，宽3分米，高5分米．向容器中倒入28.5L水，再把一个铁块放入水中，这是量得容器内的水深35厘米．这个铁块的体积是多少？
<gadget id="calculator">35 / 10</gadget>
<output>7/2 = around 3.5</output>

<gadget id="calculator">4 * 3 * (7/2)</gadget>
<output>42</output>

<gadget id="calculator">42 - 28.5</gadget>
<output>13.5</output>

<result>13.5</result>