The ratio of male to female in a city is 3 ∶ 7. The children percentage among male and female is 25% and 30% respectively. If the number of adult males in the city is 18000, then find population of city.
1. 60,000
2. 40,000
3. 75,000
4. 80,000
1. 60,000
2. 40,000
3. 75,000
4. 80,000
Correct Answer – Option 4 : 80,000
Given:
Ratio of male to female = 3 ∶ 7
Children % among male = 25%
Children % among female = 30%
Number of adult males = 18000
Calculation:
Let the number of males and females be 3x and 7x respectively
Total population = 3x + 7x = 10x
Percentage of adult males = (100 – 25)% = 75%
Adult males = 75% of 3x = 9x/4
⇒ 18000 = 9x/4
⇒ 9x = 18000 × 4 = 72000
⇒ x = 8000
Total population = 10x = 10 × 8000 = 80000
∴ Total population of the city is 80,000