Final answer:
Walter will have earned 16 days of vacation after working for 2 years.
Step-by-step explanation:
To calculate the number of vacation days Walter will have earned after working for 2 years, we can set up a proportion using the information given. We know that Walter earned 6 days of vacation after working for 9 months. We can set up the proportion:
9 months / 6 days = 24 months / x days
Cross multiplying, we have:
9x = 24 * 6
Solving for x, we find that:
x = (24 * 6) / 9
x = 16
Therefore, Walter will have earned 16 days of vacation after working for 2 years.