Question 1013409
The character which looks like the ONE digit is a very bad choice for a variable because it interferes with reading.


L for length, w for width.
The length of a room is four times its width,
{{{L=4w}}};



...perimeter is 250 feet.
{{{2L+2w=250}}}
{{{L+w=125}}}
{{{4w+w=125}}} by substitution;
{{{5w=125}}}
{{{highlight(w=25)}}}