A sealed cuboid glass box, filled with water, measured from the inside, has a length of 30 cm, a width of 10 cm, a height of 15 cm, and a depth of 5 cm. If the left side of the box is placed on the table as the bottom, what is the depth of the water in centimeters?
一个密封的长方体玻璃箱，里面装水，从里面量，长30厘米，宽10厘米，高15厘米，水深5厘米．如果把箱子的左侧面作为底面放在桌面上，那么水深多少厘米．
<gadget id="calculator">10 * 15</gadget>
<output>150</output>

<gadget id="calculator">5 / 150</gadget>
<output>1/30 = around 0.033333</output>

<gadget id="calculator">30 * 10 * (1/30)</gadget>
<output>10</output>

<result>10</result>