Two barrels of oil, A and B, weigh 60 kilograms in total. After pouring (1/3) from barrel A into barrel B, the two barrels of oil weigh the same. How much does the original weight of barrel B weigh?
甲乙两桶油共重60千克，从甲桶倒出(1/3)倒入乙桶后，两桶油同样重，原来乙桶油重多少千克？
<gadget id="calculator">60 / 2</gadget>
<output>30</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">30 / (2/3)</gadget>
<output>45</output>

<gadget id="calculator">60 - 45</gadget>
<output>15</output>

<result>15</result>