Reference for Ketubot 135:16

ומי אמר רבא הכי והתניא רבי אומר בת הניזונת מן האחין נוטלת עישור נכסים ואמר רבא הלכתא כרבי לא קשיא הא דאמידניה הא דלא אמידניה

But could Rava have said this? Surely it was taught: Rabbi said: A daughter who is maintained by her brothers is to receive a tenth of [her father’s] estate; and Rava said that the law is in agreement with Rabbi! This is no difficulty. The former [is a case] where we estimated how much he could give, and the latter is a case where we did not estimate how much he could give.

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