To have the same amount of every snack, just keep putting the multiple of all the number until they all share at least one together
Bagels: 6, 12, 18, 24, 30, 36, 42, 48, 54, 60, 66, 72
Apples: 8, 16, 24, 32, 40, 48, 56, 64, 72
Cookies: 12, 24, 36, 48, 60, 72
Juice Boxes: 9, 18, 27, 36, 45, 54, 63, 72
They all share 72
Since the bagels come in boxes of six, divide the 72 bagels by 6
You get 12 boxes
So Olivias' mom will buy 12 boxes of bagels
Hope this helps
-GoldenWolfX✔