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

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