In a zoo, there are rabbits and peacocks. The combined number of their heads is 60, and the total number of legs is 192. How many rabbits are there in total?

Explanation

Let the number of rabbits be r and the number of peacocks be p. Since each animal has one head, r + p = 60. Each rabbit has 4 legs and each peacock has 2 legs, so 4r + 2p = 192. Multiplying the first equation by 2 gives 2r + 2p = 120. Subtracting this from the second equation results in 2r = 72, so r = 36. Since 36 is not listed among the options, the correct choice is 'None of the above'.