A barrel of oil is used for the first time 20 kilograms, which is 1/3 more than the second time, and exactly 40% of the barrel of oil is used twice. How many kilograms of this barrel of oil are there?
一桶油第一次用去20千克，比第二次多用去(1/3)，两次用去的正好是这桶油的40%，这桶油有多少千克？
<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">1 + (1/3)</gadget>
<output>4/3 = around 1.333333</output>

<gadget id="calculator">20 / (4/3)</gadget>
<output>15</output>

<gadget id="calculator">20 + 15</gadget>
<output>35</output>

<gadget id="calculator">40 / 100</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">35 / (2/5)</gadget>
<output>175/2 = around 87.5</output>

<result>175/2 = around 87.5</result>