The iron and steel plant transported 120 tons of coal, and 10.8 tons remained after 7 days of use. How many tons of coal are used on average per day?
钢铁厂运进煤120吨，用了7天后还剩10.8吨，平均每天用煤多少吨？
<gadget id="calculator">120 - 10.8</gadget>
<output>109.2</output>

<gadget id="calculator">109.2 / 7</gadget>
<output>15.6</output>

<result>15.6</result>