Huaguang Machinery Factory shared 558 tons of coal in July and August last year, how many tons per day on average in these two months?
华光机械厂去年七月和八月共用煤558吨，这两个月平均每天多少吨？
<gadget id="calculator">31 + 31</gadget>
<output>62</output>

<gadget id="calculator">558 / 62</gadget>
<output>9</output>

<result>9</result>