One hundred six of the two hundred sixty three students in the auditiorium were boys. How many girls were in the auditiorium

Answer 1

do you just want confirmation of your answer, or do you really have no idea how to solve this?

Do you have any problem doing this exercise:

4 out of 6 students were boys. How many were girls?

If that's easy, just do the posted problem the same way, changing the numbers.