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Algebra Difficulty 2.0 Junior Find the answer United Kingdom

Carrie the cat and Barrie the bat together weigh $4000$ g more than Rollie the rat. Barrie and Rollie together weigh $2000$ g less than Carrie. Carrie and Rollie together weigh $3000$ g more than Barrie. What is the weight, in grams, of Rollie the rat?

(A) $250$ (B) $500$ (C) $750$ (D) $1000$ (E) $1250$

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