How many pigs in a pig pen if: Each female pig sees the same number of males and female pigs.?

Answer 1

Let M be the number of male pigs, and F be the number of female pigs. Assuming a female pig cannot see herself, she will always see M male pigs and (F - 1) female pigs.

Since these values are equal,
M = F - 1
M + 1 = F

The number of female pigs is one more than the number of male pigs. The number of total pigs is
Total = M + F
Total = M + (M + 1)
Total = 2*M + 1

So, any odd number is a possible solution for the total number of pigs.

Answer 2

Number of pigs (male and female both) in the pig pen = 2n + 1 amongst which only n are male.
Now n = natural number whatever.