There are 57 bags of rice in the cafeteria, and 12 bags have been eaten. If you eat the rest 9 bags a day, how many days can you eat?
食堂有57袋大米，已经吃了12袋，剩下的如果每天吃9袋，还可以吃多少天．
<gadget id="calculator">57 - 12</gadget>
<output>45</output>

<gadget id="calculator">45 / 9</gadget>
<output>5</output>

<result>5</result>