In a park there are two ponds with both brown ducks and green ducks. In the smaller pond there are 30 ducks and in the larger pond there are 50 ducks. If 20% of the ducks in the smaller pond are green and 12% of the ducks in the larger pond are green, then what percentage of ducks are green?
Choose the correct choice.
A) 13% B) 14% C) 15% D) 16% E) 17%
Number of ducks in small pond = 30   green ducks in small pond = 20 % of 30 = 6 ducks   Number of ducks in large pond = 50   green ducks in large pond = 12 % of 50 = 6 ducks   Total number of ducks = 30 + 50= 
<gadget id="calculator">30 + 50</gadget>
<output>80</output>
80   total number of green ducks= 6 + 6= 
<gadget id="calculator">6 + 6</gadget>
<output>12</output>
12 ducks   percentage of green ducks= 12/80 * 100= 
<gadget id="calculator">12/80 * 100</gadget>
<output>15</output>
15%   Answer: 15%
<result>C</result>
In a park there are two ponds with both brown ducks and green ducks. In the smaller pond there are 30 ducks and in the larger pond there are 50 ducks. If 20% of the ducks in the smaller pond are green and 12% of the ducks in the larger pond are green, then what percentage of ducks are green?