Final answer:
To find how many puzzles one student would complete, use the ratio 15 students : 80 puzzles and solve for x.
Step-by-step explanation:
To find out how many puzzles one student would complete, we can use the concept of ratios. We know that 15 students completed 80 puzzles, so we can set up the following ratio:
15 students / 80 puzzles = 1 student / x puzzles
To solve for x, we can cross multiply:
15x = 80
x = 80 / 15
x ≈ 5.3
Therefore, 1 student would complete approximately 5.3 puzzles.