"""Exercise 10.3.2 — Return the right value

Chapter 10: Functions — Everyday Programming

This function should return the average of three test scores.

This program contains exactly one bug. Solution: sol_10_3_2.py
"""

def average_of_three(a, b, c):
    return a + b + c / 3

print(average_of_three(80, 90, 100))  # 90.0