In a dairy farm, all cows produce 120 tons of milk in the first half of the year, which is (2/5) of the output in the second half of the year. How many tons of milk are produced in a year?
一个奶牛场，上半年所有奶牛产奶120吨，是下半年产量的(2/5)．全年产牛奶共多少吨？
<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

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

<gadget id="calculator">120 + 300</gadget>
<output>420</output>

<result>420</result>