Question 182227
Let W = the width, then the length, L = W+4
The perimeter of a rectangle is given by:
P = 2(L+W) and this is to be at least (that's greater than or equal to) 108 meters, so...
{{{2(L+W) >= 108}}} Substitute L = W+4
{{{2(W+4+W) >= 108}}} Simplify.
{{{2(2W+4) >= 108}}}Divide both sides by 2.
{{{2W+4 >= 54}}} Subtract 4 from both sides.
{{{2W >= 50}}} Divide both sides by 2.
{{{W >= 25}}}
The width, W, must be at least 25 meters.