The first barrel of oil is 28 kilograms, and the second barrel of oil is 18 kilograms. After pouring out the same weight of the two barrels of oil, the weight of the second barrel of oil is (7/12) the weight of the first barrel of oil. How many kilograms of oil are poured out? ．
第一桶油28千克，第二桶油18千克，两桶油倒出相同的重量之后，第二桶油的重量是第一桶油重量的(7/12)，倒出的油共有多少千克．
<gadget id="calculator">7 / 12</gadget>
<output>7/12 = around 0.583333</output>

<gadget id="calculator">28 * (7/12)</gadget>
<output>49/3 = around 16.333333</output>

<gadget id="calculator">18 - (49/3)</gadget>
<output>5/3 = around 1.666667</output>

<gadget id="calculator">1 - (7/12)</gadget>
<output>5/12 = around 0.416667</output>

<gadget id="calculator">(5/3) / (5/12)</gadget>
<output>4</output>

<gadget id="calculator">4 + 4</gadget>
<output>8</output>

<result>8</result>