Final answer:
Today, around 40% of the population in developing countries aged fifteen and older are illiterate, evidencing existing educational challenges.
Step-by-step explanation:
The question is asking for the current literacy rate in developing countries among individuals aged fifteen and older. According to available data, about 40% of the people 15 years old and older in low-income countries are illiterate. This statistic reflects significant challenges in education access and quality in these regions. Despite progress over the years, as noted in the increase of those receiving at least some formal education worldwide and literacy rates globally, disparities persist. In developing countries, enrollment rates for primary schools have improved, reaching approximately 85%, yet illiteracy remains high due to various socio-economic factors.