40000 persons (male + female) visited three different metro cities viz Mumbai, Delhi and Kolkata. The number of persons visiting Mumbai and the number of persons visiting Delhi are in the ratio of 5 : 7. Out of total number of persons who visited Kolkata, 60% are females and the number of males visiting Kolkata is 5120 less than number of males who visited Delhi. Out of total number of persons who visited Mumbai, 4500 were males, while the sum of number of females who visited Delhi and number of females who visited Mumbai together is 14700.