Question

70% of students are boys in a school and the number of girls is 840 find the number of boys are in a school​

Answer 1

Total student is 100%

%of boys is 70%

%of girls is 100%-70%=30%

Number of girls is 840

Let total students be x

So 30%of x is 840

30/100*x=840

X=840*100/30

X=2700

So total student is 2700

Answer 2

70% are boys.

Percentage of girls = 100-70

= 30%

let total number of students be x

therefore,

30% of x = 840

30/100 * x = 840

x = 840*100/30

x = 2800

number of boys in the school

= 70% of 2800

= 70/100*2800

= 70*28

= 1960

Therefore, number of boys in the school = 1960

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