So because it's an equilateral triangle, you can cut the triangle in half and make a right triangle with a hypotenuse of 32. The bottom of the triangle would be half of 32, which is 16, because you cut the triangle in half. Now you can use the pythagorean theorem to solve for the height.

The answer is whatever b is:
b =

So your answer is 27.713.
A possible answer could be 13 multiplied by 3, or maybe 39 by 1. I don't really know how to explain how I got my answer, but I hope that this helped you out! :)
5 pigs: 3 chickens
pigs have four feet, so if 20 feet belong to the pigs, there's 5 pigs, because 5x4=20.
chickens have 2 feet, so if 6 feet belong to the chickens, there's 3 chickens, because 2x3=6.
the local maximum is at x = -2.2 and has a value of 72.576