There is a barrel of oil, take out (1/5) of the total at the first time, and (11/50) of the total at 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(11/50)．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">11 / 50</gadget>
<output>11/50 = around 0.22</output>

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

<gadget id="calculator">(11/50) - (1/5)</gadget>
<output>1/50 = around 0.02</output>

<gadget id="calculator">2.4 / (1/50)</gadget>
<output>120</output>

<result>120</result>