There is a batch of goods in the store. On the first day, (2/5) of the total amount was shipped, and on the second day, 4 tons more than the total amount (1/4) was shipped. At this time, there are still 17 tons left. How much is the total amount of this batch of goods? Ton?
商店里有一批货，第一天运走了总数的(2/5)，第二天运走的比总数的(1/4)多4吨，这时还剩17吨，这批货物共有多少吨？
<gadget id="calculator">17 + 4</gadget>
<output>21</output>

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

<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">1 - (2/5) - (1/4)</gadget>
<output>7/20 = around 0.35</output>

<gadget id="calculator">21 / (7/20)</gadget>
<output>60</output>

<result>60</result>