There is a barrel of oil, pour out (1/5) for the first time, pour out 19 kilograms for the second time, and pour out the sum of the previous two times for the third time, and there is still (1/8) of the barrel of oil left , how many kilograms is this barrel of oil?
有一桶油，第一次倒出(1/5)，第二次倒出19千克，第三次倒出的是前两次的总和，此时还剩下这桶油的(1/8)，这桶油有多少千克？
<gadget id="calculator">19 + 19</gadget>
<output>38</output>

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

<gadget id="calculator">1 / 8</gadget>
<output>1/8 = around 0.125</output>

<gadget id="calculator">1 - (1/5) - (1/5) - (1/8)</gadget>
<output>19/40 = around 0.475</output>

<gadget id="calculator">38 / (19/40)</gadget>
<output>80</output>

<result>80</result>