In order to encourage residents to save water, the water supply company stipulates that when the water consumption per person per month cannot exceed 2m**3, it will be charged at 1.6 yuan/m**2, and the part exceeding 2m**3 will be charged at 5 yuan/m**2. Mr. Li's family of 3 people paid a total of 29.6 yuan for water last month. Please calculate how many meters Mr. Li used last month?
自来水公司为了鼓励居民节约用水，规定每人每月用水不能超过2m**3时，按1.6元/m**2，超过2m**3的部分按5元/m**2收费．李老师家3口人，上月共缴水费29.6元．请你算一算李老师上月用水多少米？
<gadget id="calculator">3 * 2</gadget>
<output>6</output>

<gadget id="calculator">6 * 1.6</gadget>
<output>9.6</output>

<gadget id="calculator">29.6 - 9.6</gadget>
<output>20</output>

<gadget id="calculator">20 / 5</gadget>
<output>4</output>

<gadget id="calculator">6 + 4</gadget>
<output>10</output>

<result>10</result>