Julius sold five times as many computers as sam sold last year. in total, they sold 78 computers. how many computers did julius sell?

Let x = # of computers sold by Sam; then 5x = # of computers sold by Julius

 

our equation becomes x + 5x = 78

 

which becomes 6x = 78

 

solving, x = 13 which is the # of computers sold by Sam

 

so 5x = 5(13) = 65 which is the number of computers sold by Julius