Rava asks: If one said: I am hereby a nazirite after twenty days, and I am hereby a nazirite from now for one one hundred days, what is the halakha?
The next page resolves the question:
Tosefta (2:5): If one says: I am hereby a nazirite after twenty days, and I am hereby a nazirite from now for one hundred days, then he...
If Rava is aware of the Tosefta, why does he ask the question?
If he is not aware of it, how come he uses the exact same sample numbers?
My guess is that the numbers were made identical by the editors - is this reasonable?