Number of persons (in thousands) affected by COVID-19 in five cities A–E and affected Male:Female ratio.
| City | Affected (thousands) | Male:Female |
|---|---|---|
| A | 64 | 5:3 |
| B | 54 | 5:4 |
| C | 16 | 3:1 |
| D | 48 | 7:5 |
| E | 27 | 2:1 |
What is the difference between the total number of males in cities B, C and E together and the total number of females in cities A, C and D together who are affected by COVID-19?
A15000
B13000
C12000 ✓ Correct
D14000
Correct answer: (C) 12000
Explanation
Males in B, C and E are 30000, 12000 and 18000, giving a total of 60000.
Males in City B are 5 by 9 of 54000, equal to 30000.
Males in City C are 3 by 4 of 16000, equal to 12000, and in City E 2 by 3 of 27000, equal to 18000.
Females in A, C and D are 24000, 4000 and 20000, giving a total of 48000.
The difference between 60000 and 48000 is 12000.
Grouped comparison sums each requested set separately before subtracting.
Reading the correct ratio share for each city is the key to accuracy.
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