In a cuboid water tank with a bottom area of 72 square centimeters and a height of 10 centimeters, a cube iron block with a side length of 6 cm is put in, and the water surface height is 7.2 cm. If the iron block is taken out of the water, How many centimeters has the water level dropped?
一个底面积为72平方厘米，高10厘米的盛有水的长方体水槽中，放入一个棱长为6厘米的正方体铁块后，水面高为7.2厘米，如果把这个铁块从水中拿出，水面下降了几厘米？
<gadget id="calculator">6 / 72</gadget>
<output>1/12 = around 0.083333</output>

<gadget id="calculator">6 * 6 * (1/12)</gadget>
<output>3</output>

<result>3</result>