Juan is making a pasta salad to serve at noon on saturdayThe takes 90 minutes prepare and needs chill for least 4 hoursWhat time should juan begin?

To determine the time Juan should begin preparing the pasta salad, we need to work backward from the desired serving time.

1. Serving Time: Noon on Saturday

2. Chilling Time: At least 4 hours

3. Preparation Time: 90 minutes (1.5 hours)

Add the chilling time to the serving time:

12:00 PM (Noon) + 4 hours = 4:00 PM

Subtract the preparation time from the chilling start time:

4:00 PM - 1.5 hours = 2:30 PM

Therefore, Juan should begin preparing the pasta salad at 2:30 PM on Saturday to ensure it has enough time to chill before serving at noon.