There are 120 legs and 50 heads of some ducks and horses grazing in a field. Find the number of horses.
Correct Answer: Option B
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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