There is a barrel of oil, (1/5) of the total amount is taken out for the first time, and (1/4) of the total amount is taken out for the second time, if the second time is 2.4 kg more than the first time, what is the original weight of the barrel of oil?
有一桶油，第一次取出总数的(1/5)，第二次取出总数的(1/4)，若第二次比第一次多取出2.4千克，则这桶油原来重多少千克．
<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

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

<gadget id="calculator">(1/4) - (1/5)</gadget>
<output>1/20 = around 0.05</output>

<gadget id="calculator">2.4 / (1/20)</gadget>
<output>48</output>

<result>48</result>