In a school there are 362 boys and 257 girls. 403 more girls joined the school. How many more girls than boys does the school have?
There are 362 boys and 257 girls in the school. 

403 more girls joined the school. 

That means there are 660 girls in the school now. 

There are 660 girls and 362 boys in the school. 

That means there are 298 more girls than boys in the school.