A flour mill grinds 6 kilograms of flour per hour, how many hours does it take to grind 126 kilograms of flour?
一台磨面机每小时磨面粉6千克，要磨面粉126千克，需要几小时？
<gadget id="calculator">126 / 6</gadget>
<output>21</output>

<result>21</result>