A $3491$ by $3491$ square has its length decreased by $60$ and its width increased by $60$.  By how much does its area change?
Question:
A $3491$ by $3491$ square has its length decreased by $60$ and its width increased by $60$.  By how much does its area change?
Answer:
Let's think step by step.

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3600
A $3491$ by $3491$ square has its length decreased by $60$ and its width increased by $60$.  By how much does its area change?
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