A barrel of oil is sold (1/3) and then 25kg is added. At this time, the oil is reduced by (1/8) compared to the original one. How many kilograms is this barrel of oil originally?
一桶油卖了(1/3)后又加入25kg，这时的油比原来减少了(1/8)，这桶油原来有多少千克？
<gadget id="calculator">1 / 8</gadget>
<output>1/8 = around 0.125</output>

<gadget id="calculator">1 - (1/8)</gadget>
<output>7/8 = around 0.875</output>

<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">1 - (1/3)</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">(7/8) - (2/3)</gadget>
<output>5/24 = around 0.208333</output>

<gadget id="calculator">25 / (5/24)</gadget>
<output>120</output>

<result>120</result>