What is the missing number
20,30,25,35,... ,40.

• ans: 30
  20+10=30
  30-5=25
  25+10=35
  35-5=30
  30+10=40
• 10 years agoHelpfull: Yes(2) No(0)
• 20,30,25,35,---,40
  every diff is 10 so 20,30,25,35,30,40 ans:30
  
• 10 years agoHelpfull: Yes(1) No(0)