Question 947597
The pond dimensions are w and L.
L=2w;
total area wall and pond:  {{{(L+2*3)(w+2*3)}}}
area just of wall:  {{{(L+6)(w+6)-wL=132}}}



simplify wall area equation some:  
{{{(wL+6w+6L+36)-wL=132}}}
{{{6w+6L+36-132=0}}}
{{{w+L-16=0}}}----------something seems off here.


Simple equation in just w and L.
Substitute for the description of L:
{{{w+2w-16=0}}}
{{{3w=16}}}
{{{highlight(w=16/3)}}} and from described L,   {{{highlight(L=32/3)}}}.