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1. The city at 1st position with the largest population, have a population of 64 million.

   Given, the population of the 4th largest city in country a is 8 million.

   we have to find the population of the largest city in that country and

   we have options : 16 million, 24 million, 32 million and 64 million

   As, the given city with 8 million population is at 4th position in the country.

   then, the city at 3rd position will be having a population of 2×8 million i.e. 16 million

   similarly, the city at 2nd position will be having a population of 2×16 million i.e. 32 million

   and the city at 1st position will be having a population of 2×32 million i.e. 64 million.

   So, the city at 1st position have a population of 64 million.

   Hence, the city at 1st position have a population of 64 million.

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