Answer :
area is lw
l=40+w
wL= 40w+w^2
40w+w^2=6000
w=60 and w=-100 are the answers and since distance cannot be negative you are left with w=60
the field is 60 * 100 yards
l=40+w
wL= 40w+w^2
40w+w^2=6000
w=60 and w=-100 are the answers and since distance cannot be negative you are left with w=60
the field is 60 * 100 yards