In a school there are 732 girls and 761 boys. 682 more girls and 8 more boys joined the school. How many girls are there in the school now?
et $x$ be the number of boys in the school, $y$ be the number of girls in the school. 

The total number of students in the school is $x + y = 968$. 

The number of girls is two times the number of boys, so $y = 2x$. 

Plugging this in the first equation gives us $x + 2x = 968$, which is equivalent to $3x = 968$. 

So $x = 324$ and $y = 648$.