math
posted by terrence .
tanya could not belive that she was on the phone this week a total of 15 hours!last week,she was on the phone for only three 3/8 of an hour less!how many hours was tanya on the phone last week?

15  3 3/8 = ?
Changing 15 to 14 8/8 (which is the same thing) before subtracting may make it easier.
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