There is a batch of goods in the market, 1/3 of the total number was shipped off on the first day, and 4 tons were shipped off on the second day. At this time, there are still 20 tons left. How many tons are there in total in this batch?
商场上有一批货物，第一天运走了总数的(1/3)，第二天运走4吨，这时还剩20吨，这批货物共有多少吨？
<gadget id="calculator">4 + 20</gadget>
<output>24</output>

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

<gadget id="calculator">1 - (1/3)</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">24 / (2/3)</gadget>
<output>36</output>

<result>36</result>