In order to win the fall election, Joe Biden has decided to start a rumor about the presidents. He figures if he tells a certain number of people this rumor, and they intern tell the same number of people, eventually every person in the country will have heard it by election day.

Assume that if he tells five people, each of those five people will tell 5 more, etc.

Joe has seven days to spread the rumor, how many people will he need to tell so that everyone will have her there by the seventh day? Make sure you were able to back up your answer with math.

There are currently 255 million Americans were old enough to vote.