Saying that there are 6 students that play flute for every four that play saxophone. 4+6= 10 and we need 50 so we have to multiply each by 5. 6 times 5 is 30. therefore there are 30 flute students. but we are looking for saxophone! 4 times 5 is 20 so there would be 20 saxophone players.
There are 20 saxophone players. For every 6 flutes there are 4 saxophones so if you do 6x5=30. Then you would do 4x5 and get 20. 30 flutes plus 20 saxophones = 50 total students
