A batch of chemical fertilizers is transported. (1/4) of the total number is transported on the first day, and (1/5) of the total number is transported on the second day. A total of 270 tons are transported in two days. How many tons are there in this batch of chemical fertilizers?
运送一批化肥，第一天运走总数的(1/4)，第二天运走总数的(1/5)，两天共运走270吨，这批化肥共有多少吨？
<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">(1/4) + (1/5)</gadget>
<output>9/20 = around 0.45</output>

<gadget id="calculator">270 / (9/20)</gadget>
<output>600</output>

<result>600</result>