Table shows the percentage of doctors and of female doctors in seven cities A to G. Total doctors = 2400; male:female = 5:3.
| City | Doctors (%) | Female Doctors (%) |
|---|---|---|
| A | 19 | 24 |
| B | 21 | 16 |
| C | 9 | 11 |
| D | 12 | 8 |
| E | 17 | 16 |
| F | 14 | 19 |
| G | 8 | 6 |
What is the difference between the average number of male doctors of cities A, B and C together and the average number of male doctors of cities E, F and G together?
A48
B50 ✓ Correct
C54
D56
Correct answer: (B) 50
Explanation
The difference is 50, so the answer is 50.
The male doctors are City A 240, City B 360 and City C 117.
Their average is 717 divided by 3, which is 239.
The male doctors are City E 264, City F 165 and City G 138.
Their average is 567 divided by 3, which is 189.
The difference is 239 minus 189.
That is 50.
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