There are some pigeons and hares in a zoo. If heads are counted, there are 250. If legs are counted, there are 580. The number of hares in the zoo is?	Choose the correct answer.
A) 40	B) 50	C) 60	D) 70	E) 80
250*2= 
<gadget id="calculator">250*2</gadget>
<output>500</output>
500   580   -----   80   1----2   ?----80= 40   40NSWER:40
<result>A</result>
There are some pigeons and hares in a zoo. If heads are counted, there are 250. If legs are counted, there are 580. The number of hares in the zoo is?