Question

70% of the students in a school are boys and the number of girls is 504. Find the number of boys in the school

Answer 1

70 % = boys 30 %= girls
then 1% = 504/30
and 70% =504/30×70
=1176

Answer 2

Given that,

Number of girls = 504

Percentage of boys in a school = 70%

So, Percentage of girls in a school will be 30%

Let the total students in a school be X.

We need to calculate the value of X

Using formula of percentage

$30\%\ of\ X=504$

$\dfrac{30}{100}\times X=504$

$X=504\times\dfrac{100}{30}$

$X=1680$

We need to calculate the number of boys in the school

Using formula for numbers of boys

X=number of girls + Number of boys

Put the value into the formula

$1680=504 + Number\ of\ boys$

$Number\ of\ boys=1680-504$

$Number\ of\ boys=1176$

Hence, The number of boys in the school is 1176.