After injecting 0.5L of water into a cuboid container with a height of 30cm, the height of the water surface is 5cm. If another 0.2L of water is injected, what is the height of the water surface in centimeters?
在一个高度为30cm的长方体容器中注入0.5L水后，水面的高度是5cm，如果再注入0.2L水，那么水面的高度是多少厘米？
<gadget id="calculator">5 / 0.5</gadget>
<output>10</output>

<gadget id="calculator">10 * 0.2</gadget>
<output>2</output>

<gadget id="calculator">2 + 5</gadget>
<output>7</output>

<result>7</result>