Answer:
...x= pigeons
(24-x) = donkeys
pigeons have 2 legs = 2x
donkeys have 4 legs = 4(24-x)
for a total of 66 legs
2x+4(24-x)=66
2x+96-4x =66
-2x=66-96
-2x=-30
x=15
so there are 15 pigeons, 9 donkeys
we check:
15*2 + 9*4 = 30+36 = 66
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