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