A pile of coal, its (1/5) is used for the first time, and the remaining (1/4) is used for the second time, and there is still 360kg left at this time, how many kilograms does this pile of coal have?
一堆煤，第一次用去它的(1/5)，第二次用去余下的(1/4)，这时还剩360kg，这堆煤原有多少千克？
<gadget id="calculator">1 / 5</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">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">(4/5) * (1/4)</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">1 - (1/5) - (1/5)</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">360 / (3/5)</gadget>
<output>600</output>

<result>600</result>