Research suggests that the level of functional illiteracy in the united states is about what share of adults?

The level of functional illiteracy in the United States is about 14 percent of adults. Illiteracy can affect a person socially and economically, making it difficult for these persons to get jobs and support their families and selves. This has links with poverty and crime.

Math, astronomy, numeric system using base 60 for the use of tell in time and degrees