There are 960 kilograms of flour in the cafeteria, and 60 kilograms are left after eating for 45 days. How many kilograms are eaten per day on average?
食堂有面粉960千克，吃了45天后还剩60千克，平均每天吃多少千克？
<gadget id="calculator">960 - 60</gadget>
<output>900</output>

<gadget id="calculator">900 / 45</gadget>
<output>20</output>

<result>20</result>