The school cafeteria burned 9.3 tons of coal in May and 9 tons of coal in June. How many tons of coal was burned per day on average for two months?
学校食堂五月份烧煤9.3吨，六月份烧煤9吨，两个月平均每天烧煤多少吨？
<gadget id="calculator">9.3 + 9</gadget>
<output>18.3</output>

<gadget id="calculator">31 + 30</gadget>
<output>61</output>

<gadget id="calculator">18.3 / 61</gadget>
<output>0.3</output>

<result>0.3</result>