In order to save water, a certain city stipulates that: each household’s monthly water consumption shall not exceed 15 cubic meters, and the fee shall be 1.6 yuan per cubic meter. If Xiao Ming’s family pays 33.6 yuan for water in June, how much cubic meters of water does Xiao Ming’s family actually use in June?
为了节约用水，某市规定：每户居民每月用水不超过15立方米，按每立方米1.6元收费，超过15立方米，则超过部分按每立方米2.4元收费．小明家六月份交水费33.6元，则小明家六月份实际用水多少立方米．
<gadget id="calculator">15 * 1.6</gadget>
<output>24</output>

<gadget id="calculator">33.6 - 24</gadget>
<output>9.6</output>

<gadget id="calculator">9.6 / 2.4</gadget>
<output>4</output>

<gadget id="calculator">15 + 4</gadget>
<output>19</output>

<result>19</result>