Question

40% of the students in a school band play brass instruments while 4 students play strings instruments

Answer 1

10 students (brass)=40% of band
4 students (strings)=16% of band 
? students (other)=44% rest of band
14/56%=?/44%
(cross multiply to find ?){don't forget to turn percents into decimals}
?=11
There are 25 students in total in the band.