6. 120, 315, 300, 345, ? ?- 390

• 120,315,300,345,390,360,435
  i think it should be like this
  300-120=180 345-315=30
  390-300=90 so, 360-345=15
  435-390=45
• 10 years agoHelpfull: Yes(0) No(0)