Dan owns 9 dvds .his brother mark has 3 more dvds than dan has their sister has more dvds than either of her brothers together the three have 35 dvds how many dvds does there sister have?

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Dan owns 9 dvds .his brother mark has 3 more dvds than dan has their sister has more dvds than either of her brothers together the three have 35 dvds how many dvds does there sister have?