A shopping mall shipped a batch of refrigerators, sold (1/4) of the total number on the first day, and sold (2/5) of the total number on the second day, what fraction of the total number of refrigerators are left after two days?
某商场运进一批冰箱，第一天卖出总数的(1/4)，第二天卖出总数的(2/5)，两天后还剩冰箱是总数的几分之几？
<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 - (1/4) - (2/5)</gadget>
<output>7/20 = around 0.35</output>

<result>7/20 = around 0.35</result>