The grain store shipped a batch of rice, sold (1/4) in the first week, and sold (1/5) in the second week, leaving 22 tons. How many tons is this batch of rice?
粮店运来一批大米，第一周卖出(1/4)，第二周卖出(1/5)，还剩22吨，这批大米有多少吨？
<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 - (1/4) - (1/5)</gadget>
<output>11/20 = around 0.55</output>

<gadget id="calculator">22 / (11/20)</gadget>
<output>40</output>

<result>40</result>