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Let there be d ducks and h horses in the field.

Then number of total heads in the field = (d + h),

And number of total legs in the field = (2 × d + 4 × h).

According to the question,

d + h = 50 ----(1)

2d + 4h = 120 ----(2)

Solving both equations, we get,

2h = 20, or, h = 10

And, d = 40.

Hence, there are 10 horses in the field.

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