How do we set up a formula for this question: You've bought your weekly egg supply at the local farm store. The first morning you have company for breakfast and use half the eggs plus one-half an egg. The next morning you use one-half of what's left plus one-half and egg. The third morning you use one-half of what's left plus one-half an egg and on the fourth morning, you're down to one solitary egg, so you make French toast. in all this cooking, you've never had one-half an egg to carry over to the next day. How many eggs did you buy originally?