Answer :
W=2L
P=300=2(L+W)
so
300=2(L+W)
divide by 2
150=L+W
W=2L
subsitute
150=L+2L
150=3L
divide by 3
50=L
sub back
W=2L
W=2(50)
W=100
the field is 100yd wide by 50yd long
P=300=2(L+W)
so
300=2(L+W)
divide by 2
150=L+W
W=2L
subsitute
150=L+2L
150=3L
divide by 3
50=L
sub back
W=2L
W=2(50)
W=100
the field is 100yd wide by 50yd long