Amy looked out the window and saw some ducks and mules.
She counted 66 legs. How many of each animal did she see if there were 24
animals total? 9 mules, 15 ducks. Take 66 divided by 2 (ducks) = 33. Only
24 total, so 33-24=9 (4 legs). 24-9= 15 ducks
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