Let

**x**be the weight of the elephant,

**y**be the weight of the mosquito. Call the sum of the two weights

**2v**, then x+y=2v

From this equation we can obtain two more:

x - 2v = -y

and

x = -y + 2v

multiply:

x^2 - 2vx = y^2 - 2vy

add v^2:

x^2 - 2vx + v^2 = y^2 - 2vy + v^2

OR

(x-v)^2 = (y-v)^2

take square roots:

(x-v) = (y-v)

x = y

The elephant's weight equals the mosquitoes.

What is wrong here?