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OpenStudy (anonymous):

Barb, Shelley, and Darcy are college roommates. Barb goes to the library every 6 days, Shelley goes the library every 7 days, and Darcy goes to the library every 4 days. If all three of them went to the library today, when is the next time that they will all be at the library on the same day?

OpenStudy (plasmataco):

84 days?...

OpenStudy (plasmataco):

7*3*4

OpenStudy (anonymous):

If today is Saturday, they will all be in the library on Saturday, 84 days from now if I am not mistaken...

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