| City | Percentage of persons not attending seminar | Percentage of male attending seminar | Male : Female (Not attending seminar) |
| A | 60% | 60% | 7 : 5 |
| B | 75% | 25% | 4 : 5 |
| C | 35% | 30% | 2 : 3 |
| D | 20% | 70% | 2 : 1 |
Let the total number of persons in city A and city D be x and y respectively,
Number of persons attended seminar from city A = 0.4x
Difference between number of male and female attended seminar = 0.4x * 20/100
=> 0.08x
0.08x = 192
x = 2400
Number of persons attended seminar from city D = 0.8y
Number of females attended seminar from city D = 0.8 * 30/100 = 0.24y
0.24y = 864
y = 3600
Total number of persons in city A = 2400
Total number of persons attending seminar from city D = 3600 * 80/100 = 2880
Required ratio = 2400 : 2880 = 5 : 6
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