We will give solution to the following problem: '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?'

Let 'x' represent the number of boys, then the total number of students is 'x + 540".

We know that 70% of x + 540 is x so we can write the following equation:

0.70(x + 540) = x

........

click here to see the equation solved for x

........

x = 1260 boys

The number of boys in the school is 1260.