piece of lead with a volume of 120 cubic centimeters is immersed in a cuboid container with a length of 6 cm, a width of 5 cm, and a height of 18 cm. At this time, the height of the water surface is 13 cm. If the piece of lead is taken out of the cuboid container, what is the height of the water surface in centimeters?
把一块体积为120立方厘米的铅块，浸没在长是6厘米，宽是5厘米，高是18厘米的长方体容器中，这时水面高度为13厘米．如果把这块铅块从长方体容器中捞出，水面高度是多少厘米？
<gadget id="calculator">6 * 5</gadget>
<output>30</output>

<gadget id="calculator">120 / 30</gadget>
<output>4</output>

<gadget id="calculator">13 - 4</gadget>
<output>9</output>

<result>9</result>