There are two barrels of oil, and the weight of the second barrel is 1.5 times that of the first barrel. If 2 kilograms are taken from the second barrel and put into the first barrel, the weight of the two barrels of oil is equal. How many kilograms is there in the first barrel?
有两桶油，第二桶重量是第一的1.5倍，如果从第二桶中取出2千克放入第一桶中，这时两桶油的重量相等，第一桶有多少千克？
<gadget id="calculator">1.5 - 1</gadget>
<output>0.5</output>

<gadget id="calculator">2 / 0.5</gadget>
<output>4</output>

<gadget id="calculator">2 * 4</gadget>
<output>8</output>

<result>8</result>