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Mathematics 21 Online
OpenStudy (anonymous):

40 books in 16 minutes choices: 40 books in 1 minute 1 book in 16 minutes 2.5 books in 1 minute 10 books in 4 minutes

OpenStudy (jlastino):

If you would simplify 40/16 you get 2.5/1 So 2.5 books in 1 minute

OpenStudy (anonymous):

THANK YOUUUUUUUUUUUUUUUUUUUUUUUUUUUU!

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