Question

Half of the students in Max's class volunteer at the local community center.Fifteen students do not volunteer.If there are 12 boys in Max's class, how many girls are in the class?

Answer 1

18 girls
Half of the students volunteer
15 don't -- so the other half must be 15 as well making there 30 students in the class.
If 12 are boys, then 30(students in class) - 12 (boys) = 18 girls