Question

In a school 720 or boys and 40% of girls find the number of girls

Answer 1

Given, number of boys = 720

To find, number of girls = ?

Given, % of girls = 40%


% of boys = 100% - 40%

= 60%


Let the total number of students on the school be x (Finding the total number of students is necessary to find the number of girls)


60% of x = 720

➾ $\dfrac{60}{100}$x = 720

➾ x = 720 × $\dfrac{100}{60}$

By reducing,

➾ x = 1200


Number of girls = Total number od students - Number of boys

Let x be the number of girls.

➾ x = 1200 - 720

➾ x = 480




∴ The number of girls = 480

Answer 2

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Let the total number of students be x

40% of students are girls.
Number of boys = 720

Percentage of boys in a school
= 100-40
= 60%

60% of x = 720
(60/100) × x = 720
x = 120×10
x = 1200

Number of girls
= 1200-720
= 480