A pulverizer, the first day processes (1/4) tons of feed, the second day processes more than the first day (2/5) tons, the third day processes the sum of the previous two days, and the third day processes the feed how much?
一台粉碎机，第一天加工饲料(1/4)吨，第二天比第一天多加工(2/5)吨，第三天加工的等于前两天的总和，第三天加工饲料多少呢？
<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

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

<gadget id="calculator">(1/4) + (2/5)</gadget>
<output>13/20 = around 0.65</output>

<gadget id="calculator">(1/4) + (13/20)</gadget>
<output>9/10 = around 0.9</output>

<result>9/10 = around 0.9</result>