So, Sal Khan started tutoring Nadia over the telephone, and when the exams came, her cousin dropped out of the remedial class to become the top maths student in the school. Nadia was put in lower grades in school for being weak in maths. His 12-year-old cousin, who was living in New Orleans at the time, asked for some help with maths. When Sal Khan was 20, he started working as a hedge-fund analyst in Boston. How did the idea of Khan Academy come about?
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