The complete table is:
Cups of chocolate chips 3 6 9 12
Cups of peanut butter chips 2 4 6 4
How to use unit rate?
From the given table, we see that:
The brownies have 3 cups of chocolate chips for every 2 cups of peanut butter chips.
Therefore, the unit rate is:
Unit rate = 2/3
Thus:
When brownies have 6 cups of chocolate chips:
cups of peanut butter chips = (2/3) * 6 = 4
When brownies have 9 cups of chocolate chips:
cups of peanut butter chips = (2/3) * 9 = 6
When brownies have 12 cups of chocolate chips:
cups of peanut butter chips = (2/3) * 12 = 8