A city’s water supply company stipulates that “every household’s water consumption is within 5 tons (including 5 tons), the fee is 1.6 yuan per ton, and the part of each household’s water consumption exceeds 5 tons is charged at 2 yuan per ton.” Xiaoming’s home last month Pay the water fee 38 yuan, how many tons did Xiaoming's family use last month?
某市自来水公司规定"每户的用水量在5吨以内(含5吨)，按每吨1.6元收费，每户用水量超过5吨的部分，按每吨2元收费．"小明家上月缴水费38元，小明家上月用水多少吨．
<gadget id="calculator">1.6 * 5</gadget>
<output>8</output>

<gadget id="calculator">38 - 8</gadget>
<output>30</output>

<gadget id="calculator">30 / 2</gadget>
<output>15</output>

<gadget id="calculator">15 + 5</gadget>
<output>20</output>

<result>20</result>