A farmer has a rectangular field that is divided into two parts. The first part of the field is used to grow wheat and takes up \( \frac{3}{5} \) of the total field area. The second part is used to grow corn and takes up the remaining area. If the total area of the field is 100 acres, how many acres are used to grow corn? Let's think step by step and output the final answer within \boxed{}.
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