In a school there are 697 girls and the rest are boys. If there are 228 more girls than boys how many boys are there in that school?
There are $x$ boys and $x+228$ girls in the school. 

We know that there are $697$ girls in the school. 

Therefore, we have the equation: 
$$x+228+x=697$$
$$2x=469$$
$$x=234.5$$

There are $234.5$ boys in the school.