Jamal is a door to door vacuum salesman. His weekly salary, S , is $250 plus $50 for each vacuum he sells. This can be written as S = 250 + 50 v , where v is the number of vacuums sold. If Jamal earns $1800 for a week's work, how many vacuums did he sell? If Jamal earns $1800 for a week's work, how many vacuums did he sell? If Jamal's pay was $1800 for the week, he sold vacuums.