Mary Persons has 429 milk jug lids in her collection.
There are three pyramids, each with a 15-lid base. The fourthpyramid
has an 11-lid base.Each ascending row has one less milk lid than the
previous row. There are 120 lids in all three of the large pyramids and
66 lids in the smaller one. Three extra lids were placed in the middle
of all the pyramids.