In an auto manufacturing plant the ratio of executives to assembly line workers is 1: 15. if there are 480 employees altogether how many assembly line workers are there?

Let the no. of workers be x + 15x = 16x
Total no. of employees= 480
⇒16x=480
⇒x=480/16
⇒x= 30
so 
   no. of executives = 30 employees
   no. of assembly workers = 15x
                                              = 15 * 30
                                              = 450 assembly workers