| 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 |
Total number of persons in city C = p + 480
Number of persons attending seminar = 65% of (p + 480)
Number of persons not attending seminar = 35% of (p + 480)
Number of males not attending seminar = 2/5 * 35% of (p + 480)
70/500 * (p + 480) = 280
p + 480 = 280 * 50/7
p + 480 = 2000
p = 1520
Total persons = 2000
Number of persons attending seminar = 65% of 2000 = 1300
Number of males attending seminar = 1300 * 30/100 = 390
Number of females attending seminar = 1300 - 390 = 910
Difference = 910 - 390 = 520
1520 - q = 520
q = 1000
2p + 5q = 2 * 1520 + 5 * 1000 = 3040 + 5000 = 8040
Study Notes
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