Question 38467
from your problem I am assuming that the legs are equal, and that "the base is 4 inches greater than the legs" means that the sum of the legs +4 =base.   If this isn't what you meant please let me know.
{{{2l+b=100}}}
{{{2l+2l+4=100}}}
{{{4l=96}}}
{{{l=24}}}
{{{b=52}}}

Hope this helps and feel free to contact me with further questions,
lyra