Question

Jeo is comparing the price of different boxes of cereal. One box has 16 oz. and costs $3.50. Another costs $3.89 for a 24 oz. box. What is the difference in cost, in dollars, per ounce between the two boxes of cereal?

Answer 1

The difference in cost, in dollars, per ounce between the two boxes of cereal is $0.06.

Explanation:

☆Let's solve using proportion.

☆One box:

`(16 \: oz.)/(3.50 \: dollars) = (1 \: oz.)/(x) \\ \\ (3.50)/(16) = (16x)/(16 ) \\ \\ 0.22 = x`

☆Another box:

`(24 \: oz.)/(3.89 \: dollars) = (1 \: oz.)/(x ) \\ \\ (3.89)/(24) = (24x)/(24) \\ \\ x = 0.16`

☆All we need to do is subtract:
`0.22 - 0.16 = 0.06`

☆The difference in cost, in dollars, per ounce between the two boxes of cereal is $0.06.