Final answer:
Jennifer will take 80 minutes to wash 20 windows.
Step-by-step explanation:
To find how long it will take Jennifer to wash 20 windows, we need to determine the rate at which she washes windows. Jennifer can wash 3 windows in 12 minutes, so her rate is 3 windows per 12 minutes, or 1 window per 4 minutes.
To calculate how long it will take her to wash 20 windows, we can set up a proportion:
1 window / 4 minutes = 20 windows / x minutes
Cross-multiplying, we get:
1 * x = 20 * 4
Simplifying, we find:
x = 80 minutes
Therefore, it will take Jennifer 80 minutes to wash 20 windows.