A barrel of oil, when half of it is eaten and 1 kilogram more is eaten, exactly 60% of the barrel of oil is eaten. How many kilograms does the barrel of oil weigh?
一桶油，吃掉一半又多1千克时，恰好吃掉了这桶油的60%，这桶油重多少千克？
<gadget id="calculator">60 / 100</gadget>
<output>3/5 = around 0.6</output>

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

<gadget id="calculator">(3/5) - (1/2)</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">1 / (1/10)</gadget>
<output>10</output>

<result>10</result>