Assuming that the boxes are 13.25oz/18.25oz, looks like an updated recipe could be:

- 2 boxes cake mix

- 3 eggs (rounding up from ~2.9 eggs)

- 1/2 cup neutral oil (rounding up from ~0.48c)

YMMV

I think you need 371 boxes of cake mix to skip rounding errors. Granny wants consistency.

	▲	cheschire 2 days ago \| parent \| next [-]
		The factory must grow.
	▲	twodave 2 days ago \| parent \| prev [-]
		Ostensibly not since she didn’t bother changing the recipe when the box shrank to ~15oz.