There is a cuboid container, measured from the inside, which is 6 decimeters in length, 5 decimeters in width, and 8 decimeters in height, filled with water, and the water depth is 4 decimeters. If a cube of iron with a side length of 3 decimeters is immersed in water, how many decimeters will the water level rise?
有一个长方体容器，从里面量长6分米，宽5分米，高8分米，里面注有水，水深4分米．如果把一块边长3分米的正方体铁块浸入水中，水面上升多少分米？
<gadget id="calculator">6 * 5</gadget>
<output>30</output>

<gadget id="calculator">3 / 30</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">3 * 3 * (1/10)</gadget>
<output>9/10 = around 0.9</output>

<result>9/10 = around 0.9</result>