Fruits that were mixed before the separation of Terumot and Ma'asrot

We separated Terumot and Ma'asrot from a certain batch of oranges, which were definitely Tevel (untithed). We made juice from them, added more oranges and other citrus fruits, made juice from them as well, and everything is mixed together. Now it turns out that among the Tevel oranges, there were 4 tithed oranges that got mixed in. We do not know which orange we separated as Teruma, whether these were the Tevel oranges or the tithed ones. Can we separate from the juice an amount in proportion to what could presumably be Tevel?

Hello Rabbi,

It is possible to tithe the juice according to the proportion of the mixture.

[Note that there is a concern that all four tithed oranges were part of the tithe, so for example, if you tithed four oranges on the Tevel oranges, it is possible that the tithe did not take effect at all].

There is mixing in liquids - R"H 14.

T"Z Y"D Siman 330 S"K 2 and many other places.

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