A car transports 45% of a batch of goods 9 times. According to this calculation, how many times will it take to transport this batch of goods in total.
一辆汽车9次运走一批货物的45%，照这样计算，运完这批货物共需多少次．
<gadget id="calculator">45 / 100</gadget>
<output>9/20 = around 0.45</output>

<gadget id="calculator">(9/20) / 9</gadget>
<output>1/20 = around 0.05</output>

<gadget id="calculator">1 / (1/20)</gadget>
<output>20</output>

<result>20</result>