A pool is 6 meters long, 5 meters wide, and 1.5 meters high. The water stored in the pool is 36 cubic meters. How far is the water surface from the mouth of the pool?
一个水池长6米、宽5米、高1.5米，池里所储的水是36立方米，问现在水面距池口多少米？
<gadget id="calculator">6 * 5</gadget>
<output>30</output>

<gadget id="calculator">36 / 30</gadget>
<output>6/5 = around 1.2</output>

<gadget id="calculator">1.5 - (6/5)</gadget>
<output>0.3</output>

<result>0.3</result>