Question 168097

LOOKS TO ME LIKE YOU ARE RIGHT ON WITH THE FIRST TRY!!!!!!

Let W=width of entire square
Then 0.75W=width of the blue square

Area colored red would be width of entire square minus width of blue square, or:
Area colored red=W^2-0.75W^2 and we are told that this equals 28 sq m, so, our equation to solve is:

W^2-0.75W^2=28  or
0.25W^2=28  divide each side by 0.25
W^2=112 sq m  take square root of each side
W=plus or minus 10.6 m disregard negative value for W
W=10.6 m
0.75W=0.75*10.6=7.95 m
CK
112-84=28
28=28

Hope this helps----ptaylor