Question

Hannaford sells two sizes of cheerios cereal. The smaller box contains 9 ounces and
costs $2.50. The larger box contains 20 ounces and and costs 3.79. What is the
difference in cost in dollars per ounce between the two sizes?

Answer 1

Quantity of cheerios cereal in the smaller box Hannaford sold = 9 ounces

Cost of nine ounces of cheerios cereal = $2.50

Cost of one ounce of cheerios cereal :

$= 2.50 \: \div \: 9$

$=\color{plum}\ 0.27$

Cost of one ounce of cheerios cereal in the smaller box = $0.27

Quantity of cheerios cereal in the larger box Hannaford sold = 20 ounces

Cost of nine ounces of cheerios cereal = $3.79

Cost of one ounce of cheerios cereal :

$= 3.79 \div 20$

$=\color{plum} \ 0.18$

Cost of one ounce of cheerios cereal in the larger box = $0.18

Difference in their cost per ounce :

$= 0.27 - 0.18$

$=\color{plum}\bold{\ 0.09}$

Therefore, the difference in cost in dollars per ounce between the two sizes = $0.09