120 bags of cement were shipped to the construction site, each bag was 50 kg, and 280 kg were used in the first week. Based on this calculation, how many days can the cement be used for?
工地运来120包水泥，每包50千克，第一周用了280千克，照这样计算，这些水泥可以用多少天？
<gadget id="calculator">120 * 50</gadget>
<output>6_000</output>

<gadget id="calculator">280 / 7</gadget>
<output>40</output>

<gadget id="calculator">6_000 / 40</gadget>
<output>150</output>

<result>150</result>