Answer
The field is 60 by 110.
Work Step by Step
We first write the word problem as an equation. Next, we solve the equation using substitution. Doing this, we find:
$$ 2x+2y=340 , x=y+50 \\ 2\left(y+50\right)+2y=340 \\ y=60 \\ x=60+50 \\ x=110$$