To find out how many puzzles one student would complete, you would divide the total number of puzzles by the number of students.
So, you would calculate:
\[ \text{Puzzles per student} = \frac{\text{Total puzzles}}{\text{Number of students}} = \frac{80}{15} \approx 5.33 \]
Rounding this to the nearest whole number gives:
5 puzzles.
Thus, one student would complete approximately 5 puzzles.