batch of computers were shipped from the store, 20 were sold on the first day, and 25 were sold on the second day, totaling (5/9) of the total sold. How many computers are there in total?
商店运来一批电脑，第一天卖出20台，第二天卖出25台，共卖出总数的(5/9)．这批电脑共有多少台？
<gadget id="calculator">20 + 25</gadget>
<output>45</output>

<gadget id="calculator">5 / 9</gadget>
<output>5/9 = around 0.555556</output>

<gadget id="calculator">45 / (5/9)</gadget>
<output>81</output>

<result>81</result>