Around the Jewish Year

Question

Hello Rabbi, Happy Chanukah!I would appreciate guidance on a somewhat complex halachic question.

I harvested 100 kg of olives for oil production:

• 80 kg of them were hefker (ownerless),
• 20 kg belonged to someone who gave me permission to harvest them.

When I arrived at the olive press, I was told this was too small a quantity to process alone, so I waited for someone to join me. Another person arrived with 50 kg of olives, and oil was produced from a total of 150 kg. We then divided the oil according to the percentage each of us contributed.

A. Of the oil that I received, from how many kilograms must I separate terumot and ma'aserot — from 150, 100, or 20?

B. Do I need to coordinate with the other person whose oil was mixed with mine? I understand there may be an issue of bilah belach, that liquids mix.

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