In order to encourage water conservation, a certain place stipulates that the quarterly water fee of each household shall be settled in the following way: only 2 yuan for each ton within 10 tons; and 3 yuan for each ton exceeding 10 tons. The total water bill for Mr. Wang’s house last quarter was 32 yuan. Please calculate how many tons of water you use?
某地为鼓励节约用水，规定每户居民每个季度的水费用如下方式结算：10吨以内每吨只收2元；超出10吨的，超出部分每吨要收3元．王老师家上个季度的水费一共是32元，请你算一算用水量是多少吨？
<gadget id="calculator">2 * 10</gadget>
<output>20</output>

<gadget id="calculator">32 - 20</gadget>
<output>12</output>

<gadget id="calculator">12 / 3</gadget>
<output>4</output>

<gadget id="calculator">4 + 10</gadget>
<output>14</output>

<result>14</result>