At a certain time in a deer park, the number of heads and number of legs of deer and human visitors was counted and it was found that there were 39 heads and 132 legs. find the number of deers and human visitors in the park.

Let x be the total number of legs of deer and y be the total number of legs of human visitors.
x + y = 132
1 deer has 4 legs and 1 head & 1 human visitor has 2 legs and 1 head.
(x / 4) + (y / 2) = 39
Onsolving, x = 108 and y = 24
∴ Number of deers = 108 / 4 = 27
∴ Number of visitors = 24 / 2 = 12

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