A cylindrical glass is filled with water, the water surface is 2.5 cm high, and the bottom area inside the glass is 72 square centimeters. After a cube iron block with a side length of 6 cm is put into the glass, the water surface does not submerge the iron block. At this time What is the height of the water in centimeters.
一个圆柱形玻璃杯中盛有水，水面高2.5厘米，玻璃内侧的底面积是72平方厘米，在这个杯中放进棱长6厘米的正方体的铁块后，水面没有淹没铁块，这时水面高多少厘米．
<gadget id="calculator">72 * 2.5</gadget>
<output>180</output>

<gadget id="calculator">6 * 6</gadget>
<output>36</output>

<gadget id="calculator">72 - 36</gadget>
<output>36</output>

<gadget id="calculator">180 / 36</gadget>
<output>5</output>

<result>5</result>