The amount of coal burned by the cement plant has been reduced from the original 600 tons to the current 560 tons. The coal that was burned for 84 days can be burned for a few more days now? (solution in two ways)
水泥厂每天烧煤量由原来的600吨减少到现在的560吨，原来烧84天的煤，现在可以多烧几天？(用两种方法解)
<gadget id="calculator">84 / 560</gadget>
<output>3/20 = around 0.15</output>

<gadget id="calculator">600 * (3/20)</gadget>
<output>90</output>

<gadget id="calculator">90 - 84</gadget>
<output>6</output>

<result>6</result>