If it takes Andy and Charlotte 3.5 hours to clean a house, and it take charlotte and her daughter Mary...

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If it takes Andy and Charlotte 3.5 hours to clean a house, and it take charlotte and her daughter Mary 4 hours to clean a house, and it takes all three of them together 3 hours to clean a house, how long would it take charlotte to clean the house by herself?

    • 12 years ago
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