Question

a city has male and female in the ratio of 12:13 and total population is 3.25 lakh. find the number of female

Answer 1

Let males and females be 12x and 13x
A/Q
12x +13x = 3 25 000
25x = 325000
x = 325000÷ 25
= 13000
females= 13x =13×13000 =169000

Answer 2

Answer:

Required number of female is 169000.

Step-by-step explanation:

Given,ratio of male and female in a city is 12:13.

Let, number of male in the city be 12x and number of female in the city be 13x.

It is also given that total population of the city is 3.25 lakh.

According to question,

$12x + 13x = 3.25 \: lakh \\ 12x + 13x = 3.25 \times 100000 \\ 25x = 325000 \\ x = \frac{325000}{25 } \\ x = 13000$

Therefore total number of male is (12×13000) = 156000

and total number of female is (13×13000) = 169000

This is a problem of Algebra.

Some important Algebra formulas.

(a + b)² = a² + 2ab + b²

(a − b)² = a² − 2ab − b²

(a + b)³ = a³ + 3a²b + 3ab² + b³

(a - b)³ = a³ - 3a²b + 3ab² - b³

a³ + b³ = (a + b)³ − 3ab(a + b)

a³ - b³ = (a -b)³ + 3ab(a - b)

a² − b² = (a + b)(a − b)

a² + b² = (a + b)² − 2ab

a² + b² = (a − b)² + 2ab

a³ − b³ = (a − b)(a² + ab + b²)

a³ + b³ = (a + b)(a² − ab + b²)

Know more about Algebra,

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