There is a barrel of oil, (1/3) is used on the first day, and the rest (1/2) is used on the second day, leaving 60kg. How many kilograms is this barrel of oil originally?
有一桶油，第一天用去(1/3)，第二天用去余下的(1/2)，还剩下60kg．这桶油原有多少千克？
<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</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">60 / (1/2) / (2/3)</gadget>
<output>180</output>

<result>180</result>