Question 968493
A = 1260 m^2
Area = L*W = 1260 .......1
Condition
L = 48 + 3W 
Put in 1
(48+3W)W=1260
(16+W)W=420
W^2+W-420 =0
W=14, -30
Length is alwys +ve
So W=14
L =90