Less than 10% of Brazilians,Knows English(menos de 10% dos Brasikeiros sabem Inglês)

Question

Is This Worrying???(Isto é Preocupante)???

I Did Learn english,At 14 years in elementar and middle school,at 9th year(9°ano)

Answer 1

In English, percentages follow the "noun count rule". Since 'Brazilians' is plural, the verb must also be plural. But, overall, your sentence was good because it clearly showed what you meant.