The ratio of male to female in a city is 3 ∶ 7. The children percent

1.	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. 60,0002. 40,0003. 75,0004. 80,000
Answer» 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

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. 60,0002. 40,0003. 75,0004. 80,000

Answer» 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

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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. 60,0002. 40,0003. 75,0004. 80,000

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