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Population density of Pakistan at 260/km2 is nothing compared to countries like Singapore with a population density of 7600/km2. Educating kids and making employment opportunities for them will be the first and formost plan of the government.
This means Karachi is by far more dense than any other megacity with an urban population of more than 10 million except Dhaka, Bangladesh and Mumbai. This makes Karachi the third largest city in the world and the largest in Pakistan. Karachi was previously the capital of Pakistan until Islamabad was constructed.