A cylindrical glass contains water, the water surface is 2.5 cm high, and the bottom area of the inside of the glass is 72 cm2. After putting a square iron block with a side length of 6 cm into this cup, the water surface does not submerge the iron block. How many centimeters is the water surface at this time?
一个圆柱形玻璃杯内盛有水，水面高2.5厘米，玻璃杯内侧的底面积是72平方厘米．在这个杯中放进棱长为6厘米的正方体铁块后，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>