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Mathematics, 28.07.2019 07:40, sophx
Afather and his son can clean the house together in 9 hours. when the son works alone, it takes him an hour longer to clean than it takes his dad alone. find how long it takes the son to clean alone.
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Answers: 1
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Afather and his son can clean the house together in 9 hours. when the son works alone, it takes him...
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