If an iron ball with a volume of 30 cubic centimeters is submerged in a rectangular parallelepiped glass container filled with water with a length of 5 cm and a width of 4 cm, how many centimeters will the water level rise?
将一个体积为30立方厘米的铁球没入一个长5厘米，宽4厘米的盛有水的长方体玻璃容器中，水面会上升多少厘米．
<gadget id="calculator">5 * 4</gadget>
<output>20</output>

<gadget id="calculator">30 / 20</gadget>
<output>3/2 = around 1.5</output>

<result>3/2 = around 1.5</result>