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There are deer and peacocks in a zoo By counting heads...

This question belongs to Competitive Reasoning Arithmetic Reasoning
Arithmetic Reasoning
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There are deer and peacocks in a zoo. By counting heads they are 80. The number of their legs is 200. How many peacocks are there ?

Answer & Solution
Correct Answer: Option D
Let x and y be the number of deer and peacocks in the zoo respectively. Then,
x + y = 80 ...(i) and
4x + 2y = 200 or 2x + y = 100 ...(ii)
Solving (i) and (ii), we get) x = 20, y = 60.
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