The cafeteria bought 840 kilograms of rice. How many weeks can the rice be used if an average of 12kg is used per day?
食堂买来大米840千克．如果平均每天用12千克，这些大米可以用多少个星期？
<gadget id="calculator">840 / 12 / 7</gadget>
<output>10</output>

<result>10</result>