The cafeteria brought in 562 tons of coal, 438 tons were used, and the remaining coal was planned to be used up within the month of March. How many tons of coal is used on average per day?
食堂运来562吨煤，用去438吨，剩下的煤计划在3月这一个月内用完．平均每天用多少吨煤？
<gadget id="calculator">562 - 438</gadget>
<output>124</output>

<gadget id="calculator">124 / 31</gadget>
<output>4</output>

<result>4</result>