Question

If 70%of the students in a school are boys and the number of girls is 540 find the number of boys in the school?

Answer 1

No. Of girls=540
Percentage=100%-70%
=30%
Let the total no. Of students be x

30% of x=540
30/100×x=540
X=1800
No. Of boys=1800-540
=1260

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Answer 2

Let the number of students be x.

Given that 70% of students in a school are boys.

That means the number of girls in a school = 30%.

Given that number of girls is 540.

= > 30% of x = 540

= > 30/100 * x = 540

= > 30x/100 = 540

= > 30x = 54000

= > x = 1800.


Therefore the number of boys = 1800 - 540

                                                    = 1260.



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