The school cafeteria bought 1120 kilograms of rice, and after 18 days of use, there were 220 kilograms left. How many kilograms of rice is used on average every day?
学校食堂买来1120千克大米，用了18天后，还剩220千克．平均每天用去大米多少千克？
<gadget id="calculator">1_120 - 220</gadget>
<output>900</output>

<gadget id="calculator">900 / 18</gadget>
<output>50</output>

<result>50</result>