In a tank with a bottom area of 1200 square centimeters and a depth of 30 centimeters, the water depth is 10 centimeters. Now a cuboid iron block with a side length of 20 centimeters is placed vertically in the water. At this time, the iron block is still higher than the water surface. how many centimeters?
一个底面积为1200平方厘米，深30厘米的水槽内，水深10厘米，现将一个棱长为20厘米的长方体铁块竖直放在水中，这时铁块仍高于水面，这时水面高度多少厘米？
<gadget id="calculator">20 * 20</gadget>
<output>400</output>

<gadget id="calculator">1_200 - 400</gadget>
<output>800</output>

<gadget id="calculator">10 / 800</gadget>
<output>1/80 = around 0.0125</output>

<gadget id="calculator">1_200 * (1/80)</gadget>
<output>15</output>

<result>15</result>