In order to solve the problem of lack of fresh water on the island, an island soldier and local residents jointly built a cuboid reservoir with a length of 22m and a width of 10m, which can store 396 square meters of fresh water. Now 66 square meters of soil have been dug out. ?
某海岛战士为解决岛上淡水缺乏问题，和当地居民共同修建一个长22m，宽10m，可以蓄淡水396方的长方体蓄水池，现在已经挖出66方的土，还要往下挖多深？
<gadget id="calculator">396 - 66</gadget>
<output>330</output>

<gadget id="calculator">22 * 10</gadget>
<output>220</output>

<gadget id="calculator">330 / 220</gadget>
<output>3/2 = around 1.5</output>

<result>3/2 = around 1.5</result>