Brenda want to buy one of the three cereals listed below. Determine which box is the best buy (find the unit rate for each box)

To determine the best buy, we need to calculate the unit rate for each box by dividing the price of each box by the quantity of cereal it contains.

Let's assume the three cereals are:
1. Box A: $4.99 for 12 ounces of cereal.
2. Box B: $5.49 for 16 ounces of cereal.
3. Box C: $6.99 for 20 ounces of cereal.

Unit rate for Box A: $4.99/12 ounces = $0.4158 per ounce
Unit rate for Box B: $5.49/16 ounces = $0.3431 per ounce
Unit rate for Box C: $6.99/20 ounces = $0.3495 per ounce

Comparing the unit rates, we see that Box B has the lowest unit rate at $0.3431 per ounce. Therefore, Box B is the best buy for Brenda.