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posted by p on Thursday, September 17, 2009 at 10:37am.
Jon spent 1/3 of his study time doing math homework and 2/7 preparing fo a history exam what fraction of study time remains?=2/21
1/3 = 7/21 2/7 = 6/21 7/21 + 6/21 = 13/21 21/21 - 13/21 = ?
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