A grain and oil processing factory sells a batch of vegetable oil, 40% of the total is sold in the first month, and the rest (1/3) is sold in the second month. In the end, there are 120 tons of vegetable oil left in the warehouse. How many tons of vegetable oil are there in the processing plant? ?
某粮油加工厂销售一批菜油，第一个月卖出总数的40%，第二个月卖出余下的(1/3)，最后仓库里还剩120吨菜油，加工厂共有菜油共多少吨？
<gadget id="calculator">40 / 100</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">1 - (2/5)</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">(3/5) * (1/3)</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">1 - (2/5) - (1/5)</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">120 / (2/5)</gadget>
<output>300</output>

<result>300</result>