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janet spent 1/3 of study time on one subject and 2/7 on another subject. what fraction of her study time remains?

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We first need to find the common denominator.

1/3 = 7/21
2/7 = 6/21

7/21 + 6/21 = 13/21

21/21 - 13/21 = 8/21 remaining time

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