Our school cafeteria bought 900 kilograms of rice and ate 180 kilograms in 6 days. According to this calculation, how many days can we eat the rest? (Answer with the knowledge of proportion)
我校食堂买来900千克大米，6天吃了180千克，照这样计算，剩下的还能吃几天？(用比例的知识解答)
<gadget id="calculator">900 - 180</gadget>
<output>720</output>

<gadget id="calculator">180 / 6</gadget>
<output>30</output>

<gadget id="calculator">720 / 30</gadget>
<output>24</output>

<result>24</result>