The factory will produce 126 meters cloth. 24 meters were produced in 4 hours, how many hours will it take to complete it?
工厂要生产126米布．4小时生产了24米，全部完工需要多少小时？
<gadget id="calculator">24 / 4</gadget>
<output>6</output>

<gadget id="calculator">126 / 6</gadget>
<output>21</output>

<result>21</result>