Answer
Find out the how much ounces did she buy .
To proof
let us assume that the number of ounces did she buy be x .
As given
Fruit-O-Rama sells dried pineapple for $0.25 per ounce i.e the price of each pineapple is $0.25 ounce .
Mags spent a total of $2.65 on pineapple
than the equation becomes
x × 0.25 = 2.65

x = 10 .6 ounce
therefore 10 .6 ounce she buys .
Hence proved