There are 4 identical cups filled with water, the heights of which are 5 cm, 9 cm, 6 cm and 8 cm respectively. If the four cups of water are evenly filled, what is the height of each cup of water in centimeters?
有4个一样的杯子装有水，它们装水的高度分别是5厘米、9厘米、6厘米和8厘米．如果把这四杯水分装均匀，这时每杯水的高度都是多少厘米．
<gadget id="calculator">5 + 9 + 6 + 8</gadget>
<output>28</output>

<gadget id="calculator">28 / 4</gadget>
<output>7</output>

<result>7</result>