Answer:
9 is the width of the cornfield. the area if both L and W doubled would be 252
Explanation:
all you gotta do is divide 63 by 7 and you will get the width, 9.
formula: A/L=W
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the area would be 252 if doubled both length and width because its multiplying 2 by 7 and 9, equaling to 14 and 18, which you multiply that together.