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Algebra Difficulty 1.0 Junior Find the answer United Kingdom

Molly and Holly each own a big dog. Molly's dog and Holly's dog weigh 80 kg in total. Molly's dog and a 20 kg bag of dog food weigh the same as Holly's dog. What is the weight, in kg, of Holly's dog?

(A) $20$ (B) $30$ (C) $40$ (D) $50$ (E) $60$

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