Original sentence: 18 % of Brazilians over fifteen years of age could not read or write.30% had not completed primary school.60%  of primary teachers nationally had not completed secondary school.Brazil faced a variety of educational challenges:.Close to 70 % of the labor force had not completed secondary school.In the early 1990's, primary education consisted of a mix of state and municipal schools that were geographically proximate but had differing levels of per-student resources and quality.Less than 20% had a higher education degree.Less than 40% of children nationally completed the 8 grades of primary school, compared with 70% for the LAC region, and 95% for the OECD.Only 38% of children enrolled secondary school (grades 9-11), compared with over 70% in Argentina and Chile and 91% across the OECD.The average schooling level of the labor force in 1990 was 3.8 years – less than half that of Argentina, Chile, and the OECD.The child of a father with no formal education would complete only 4 years of schooling.The teacher wage in many rural areas was less than half the minimum wage.There was no national data on student learning.There were large variations in both schooling coverage and tax revenues across jurisdictions: spending per primary student in municipal schools in parts of Northeast Brazil was less than $Rs 100 per year compared to $Rs 600 or more in state schools in the same region and $Rs 1500 or more per year in state and municipal systems in the Southeast.UNICEF rated Brazil's basic education system as last in world ranking.While the Federal Constitution gave responsibility for crèche and preschool services to municipalities and secondary education to states, responsibility for primary education remains divided between states and municipalities