A pile of coal is planned to burn 150 kilograms per day and can be burned for 24 days. After the stove is improved, the daily coal consumption is 20% less than the original plan. After the stove is improved, how many more days can this pile of coal be burned than before?
一堆煤，计划每天烧150千克，可以烧24天，改进炉灶后，每天的用煤量比原计划节约20%，改进炉灶后，这堆煤比原来可以多烧多少天？
<gadget id="calculator">20 / 100</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">1 - (1/5)</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">150 * (4/5)</gadget>
<output>120</output>

<gadget id="calculator">24 / 120</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">150 * (1/5)</gadget>
<output>30</output>

<gadget id="calculator">30 - 24</gadget>
<output>6</output>

<result>6</result>