For a batch of goods, 25% of it is transported in the first time, and 20% of it is transported in the second time. What percentage of the goods is transported in total?
一批货物，第一次运走它的25%，第二次运走它的20%，两次一共运走这批货物的百分之几？
<gadget id="calculator">25 / 100</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">20 / 100</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">(1/4) + (1/5)</gadget>
<output>9/20 = around 0.45</output>

<result>9/20 = around 0.45</result>