Question

how much trail mix will each person get if 5 people share 1/2 pound trail mix

Answer 1

Assume that each person gets an equal share.
Then the portion a person gets is
$\frac{1/2 \, pound}{5 \, persons} = ( \frac{1}{2} \times \frac{1}{5} ) \, \frac{pounds}{person} = \frac{1}{10} \, pounds/person$

Answer:  1/10 pounds per person