Your family will LOVE you for doing the shopping!
This cache involves doing some simple math problems, as well as doing the shopping!
Firstly you must travel to the posted co-ords and look for the word, "milk", "bread" or "jeans". As well as, 1, 2 or 3. Look carefully!!!
Once you have that information, you can decide which barcode and which set of math to apply on the barcoded numbers.
The posted co-ords and the GZ are in the SAME park. I recommend you bring a internet capable device, (like a smart phone), as this way you can do the math in the park, then walk the short distance to GZ.
(You could also print the description with the numbers)
E.g. If it is, milk 1, we would use the numbers on the barcode on the milk, and individually subtract that to the math that goes with number 1.
FTF to: Lemmykc CONGRATS!!! (Without any help from me)