Each day she eats a total of 1 + 1 + 2 = <<1+1+2=4>>4 pieces of jerky.
For the entire trip, she will consume a total of 4 * 5 = <<4*5=20>>20 pieces of jerky.
She gives half to her brother, which will leave her a total of 20 / 2 = <<20/2=10>>10 pieces of jerky.
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