There are 4 tons of flour in the cafeteria of the machine tool factory, and 1.12 tons are used in 7 days. According to this calculation, how many days can these flour be used?
机床厂食堂有4吨面粉，7天用去1.12吨，照这样计算，这些面粉还可以用多少天？
<gadget id="calculator">1.12 / 7</gadget>
<output>0.16</output>

<gadget id="calculator">4 / 0.16</gadget>
<output>25</output>

<gadget id="calculator">25 - 7</gadget>
<output>18</output>

<result>18</result>