Question

a) In a class 60% of the students are girls. If the total number of students is 30, what is the number of boys?
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Answer 1

Answer:

boys =42

Step-by-step explanation:

No. of girls = 60%of 30

= 18

no.of boys = 30-18

=12

Answer 2

Answer:

Number of boys = 12

Step-by-step explanation:

Given :

Percentage of girls in the school = 60%

Number of students = 30

To find :

The number of boys in the school

Taken :

To find the number of boys in the school use this formula -:

$\boxed{\rm{B=\dfrac{100\%-G\%}{100\%}\times N}}$

Where,

B = Nymber of boys

G% = Percentage of girls

N = Number of students

Solution :

$:\implies\rm{B=\dfrac{100\%-60\%}{100\%}\times30}$

$:\implies\rm{B=\dfrac{40\%}{10\cancel{0}\%}\times3\cancel{0}}$

$:\implies\rm{B=\dfrac{\cancel{40\%}}{\cancel{10}}\times3}$

$:\implies\rm{B=4\times3}$

$:\implies\rm{B=12}$

So , the number of boys in the school are 12 .

Number of girls -:

=> 30-12

=> 18

So , the number of girls are 18 .