Problema Solution
If the width of the rectangle is 20% of its length and the area is 720 square inches, what is the length
Answer provided by our tutors
let
l = length of the rectangle
w = width of the rectangle
the width is 20% of the length that is
w = 0.2*l
A = l*w is the area of the rectangle and A = 720 in^2 thus
l*w = 720
by solving the system of equations
w = 0.2*l
l*w = 720
we find
l = 60 in
w = 12 in
and
l = -12
w= - 60
not a solution since w > 0 and l>0.
The length is 60 inches.