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Robert has 12 rabbits and ducks altogether the animals have 42 legs how many ducks does Robert have?
Let the number of ducks be x, so that Robert has 12 - x rabbits.
Since rabbits have 4 legs and ducks have 2 legs, we have:
2x + 4(12 - x) = 42
2x + 48 - 4x = 42
-2x + 48 = 42 (subtract 48 to both sides)
-2x = -6 (divide by -2 to both sides)
x = 3
Thus, Robert has 3 ducks and 9 rabbits.
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