In a school there are 458 more girls than boys. If there are 692 girls how many pupils are there in that school?
There are 458 more girls than boys, so we write: 

$g = b + 458$

We know that there are 692 girls in total, so we write: 

$692 = b + 458$

We solve for $b$: 

$b = 234$

Therefore, the total number of pupils in the school is: 

$b + g = 234 + 458 =692$