There are some pigeons and hares in a zoo. If heads are counted, there are 200. If legs are counted, there are 780. The number of hares in the zoo is?	Choose one
A) 190 B) 199 C) 77 D) 66 E) 221
200*2= 
<gadget id="calculator">200*2</gadget>
<output>400</output>
400   780   -----   380   1----2   ?----380= 190   190nswer:190
<result>A</result>
There are some pigeons and hares in a zoo. If heads are counted, there are 200. If legs are counted, there are 780. The number of hares in the zoo is?