Pour 144 ml of water into a cube glass with side length 6 cm, how many centimeters is the water surface from the mouth of the glass?
把144毫升的水倒入一个棱长是6厘米的正方体玻璃杯中，水面离杯口有多少厘米．
<gadget id="calculator">6 * 6</gadget>
<output>36</output>

<gadget id="calculator">144 / 36</gadget>
<output>4</output>

<gadget id="calculator">6 - 4</gadget>
<output>2</output>

<result>2</result>