The cafeteria transported 225 tons of coal and used 105 tons in 7 days. According to this calculation, how many days can the rest be used?
食堂运进225吨煤，7天用了105吨，照这样计算，余下的可以用几天？
<gadget id="calculator">225 - 105</gadget>
<output>120</output>

<gadget id="calculator">105 / 7</gadget>
<output>15</output>

<gadget id="calculator">120 / 15</gadget>
<output>8</output>

<result>8</result>