The store shipped a batch of air conditioners, sold 20 units on the first day, and sold (1/5) of the total number on the second day. If 8 more units were sold, these two days would be exactly (2/3) of the total number of days. How many air conditioners are there in total?
商店运来一批空调，第一天卖出20台，第二天卖出总数的(1/5)，如果再卖出8台，这两就正好卖出总数天的(2/3)．这批空调共有多少台？
<gadget id="calculator">20 + 8</gadget>
<output>28</output>

<gadget id="calculator">2 / 3</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">(2/3) - (1/5)</gadget>
<output>7/15 = around 0.466667</output>

<gadget id="calculator">28 / (7/15)</gadget>
<output>60</output>

<result>60</result>