In a park there are two ponds with both brown ducks and green ducks. In the smaller pond there are 45 ducks and in the larger pond there are 55 ducks. If 20% of the ducks in the smaller pond are green and 40% of the ducks in the larger pond are green, then what percentage of ducks are green? Select the correct option
A) 25%
B) 27%
C) 29%
D) 31%
E) 33%
Number of ducks in small pond = 45   green ducks in small pond = 20 % of 45 = 9 ducks   Number of ducks in large pond = 55   green ducks in large pond = 40 % of 55 = 22 ducks   Total number of ducks = 45 + 55= 
<gadget id="calculator">45 + 55</gadget>
<output>100</output>
100   total number of green ducks= 9 + 22= 
<gadget id="calculator">9 + 22</gadget>
<output>31</output>
31 ducks   percentage of green ducks= 31/100 * 100= 
<gadget id="calculator">31/100 * 100</gadget>
<output>31</output>
31%   Answer: 31%
<result>D</result>
In a park there are two ponds with both brown ducks and green ducks. In the smaller pond there are 45 ducks and in the larger pond there are 55 ducks. If 20% of the ducks in the smaller pond are green and 40% of the ducks in the larger pond are green, then what percentage of ducks are green?