The cafeteria brought 500 kilograms of coal and burned it for 5 days, leaving 275 kilograms. How many kilograms of coal are burned per day on average?
食堂运来500千克煤，烧了5天，还剩275千克，平均每天烧煤多少千克？
<gadget id="calculator">500 - 275</gadget>
<output>225</output>

<gadget id="calculator">225 / 5</gadget>
<output>45</output>

<result>45</result>