Directions: The given passage shows the number of persons working in schools and hospitals in 4 cities A, B, C, and D
The average number of persons working in all the schools is 475 which is the same as the number of persons working in the hospital in city B. In city D, the number of persons working in the hospital is 100 less than the number of persons working in the school but 150 less than the number of persons working in the hospital in City A. The number of persons working in the school in city B is 400 which is 50 less than the number of persons working in the hospital in city D. The ratio between the number of persons in the school in city C to D is 10: 11. The number of persons working in the hospital in city C is 100 more than the average number of working persons in all schools.