A barrel of oil weighs 138 kilograms, half of the oil is poured out for the first time, and the remaining half is poured out for the second time, a total of 96 kilograms. How many kilograms does the barrel weigh?
一桶油连桶重138千克，第一次倒出油的一半，第二次又倒出余下的一半，共倒出96千克．桶重多少千克？
<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">1 - (1/2)</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">(1/2) * (1/2)</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">(1/2) + (1/4)</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">96 / (3/4)</gadget>
<output>128</output>

<gadget id="calculator">138 - 128</gadget>
<output>10</output>

<result>10</result>