Question

A Square shaped animal pen and a pen shaped like an equilateral triangle have an equal perimeters. Find the length of the sides of each pen if the sides of the triangular pen are 16 less than twice a side of the square
Pen.

Answer 1

Just translate the English into Math

"the length of the sides of each pen if the sides of the triangular pen are 16 less than twice a side of the square
Pen."
if side of square is x
side of triangular pen is 2x-16

perimeter of square --- 4x
perimeter of triangle -- 3(2x-16) = ..

aren't they supposed to be equal ??
so .....

take over.