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There are 1 + 2 = <<1+2=3>>3 people who will share 4/5 of a bag of popcorn.
So, each person will get 4/5 รท 3 = 4/5 ร 1/3 = <<4/5*1/3=4/15>>4/15 of a bag. Answer: \boxed{\frac{4}{15}}.