Question 1194662
These will all work the same no matter what the given values, if the values are meaningful.


--------------------------------------------------------------------------------------------------------------------------------------
The width of a rectangle is k less than r times its length, L. If the perimeter of the rectangle is p feet, what are the dimensions?
--------------------------------------------------------------------------------------------------------------------------------------


Dimensions,
L, length
rL-k, width
-
p, perimeter
UNKNOWN VARIABLE,  L


{{{highlight_green((rL-k)+L=p/2)}}}

{{{rL-k+L=p/2}}}

{{{(r+1)L-k=p/2}}}

{{{(r+1)L=p/2+k}}}

{{{highlight_green(L=(p/2+k)/(r+1))}}}
and you can plug in the given values and compute L.


----
----

{{{L=(30/2+15)/(2+1)}}}
{{{L=(15+15)/3}}}
{{{L=10}}}