A loom weaves 84 meters of cloth at 3 o'clock. If it works like this for 15 o'clock a day, how many meters will it weave in total?
一台织布机3时织布84米，照这样，它一天工作15时，一共织布多少米？
<gadget id="calculator">84 / 3</gadget>
<output>28</output>

<gadget id="calculator">28 * 15</gadget>
<output>420</output>

<result>420</result>