find the best buy (based on the price per ounce).?

Question

Brand X: 15 oz for $5.10
Brand Y:12 oz for $3.84


if can please show work.(Thanks)

Answer 1

Take the price of brand a and divide by the .ounces for brand a
Take the price of brand b and divide by the ounces for brand b

the one with the lowest price per ounce is the better buy
(all other things being equal)