At the moment there are 54,000 tagged birds in a certain wildlife refuge. If exactly 20 percent of all birds in the refuge are tagged, what percent of the untagged birds must be tagged so that half of all birds in the refuge are tagged?
Pick: A) 36.95 B) 37.5 C) 34.44 D) 33.91 E) 50
All birds = 54000   Currently Tagged = 54000 * 20/100= 
<gadget id="calculator">54000 * 20/100</gadget>
<output>10_800</output>
10800   So Untagged birds= 54000 - 10800= 
<gadget id="calculator">54000 - 10800</gadget>
<output>43_200</output>
43200   Half of all birds= 27000   The number of birds to be tagged to make half of all birds tagged = 27000 - 10800= 
<gadget id="calculator">27000 - 10800</gadget>
<output>16_200</output>
16200   So now the question remains - 16200 is how much percentage of untagged birds (43200)= 16200 * 100 /43200= 
<gadget id="calculator">16200 * 100 /43200</gadget>
<output>75/2 = around 37.5</output>
37.5 %   Answer (37.5)
<result>B</result>
At the moment there are 54,000 tagged birds in a certain wildlife refuge. If exactly 20 percent of all birds in the refuge are tagged, what percent of the untagged birds must be tagged so that half of all birds in the refuge are tagged?