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Mathematics, 09.11.2020 14:00 21nvargas

PLEAS ANSWEE Sally and Joan were able to dust the house in 3 hours together. It takes

Joan 10 hours to finish the same job alone. Without help, how long

would it take Sally to finish the same job ?

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PLEAS ANSWEE Sally and Joan were able to dust the house in 3 hours together. It takes

Jo...

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