3 1/2, 7 1/4, 11, 14 3/4 , 18 1/2, 20, ?

• the series can be written as 7/2,29/4,22/2,59/4,37/2,80/4
  it comprises of two series...
  from 1st series i.e., 7/2,22/2,37/2 we see.. 22/2-7/2=15/2, 37/2-22/2=15/2 so ans will be 37/2+15/2=52/2 i.e., 26.
  
• 11 years agoHelpfull: Yes(10) No(1)
• 3.5+3.75=7.25
  7.25+3.75=11
  11+3.75=14.75
  14.75+3.75=18.50
  18.50+3.75=22.25 so ans is 22.25
• 11 years agoHelpfull: Yes(5) No(2)
• 3 1/2=3.5
  7 1/4=7.25 means 3.5+3.75=7.25+3.75=11 and so on
  then 18 1/2=18.5+1.5=20+1.5=21.5
  So ans is 21.5
• 11 years agoHelpfull: Yes(3) No(15)
• ans:21
  diff of 3 1/2 and 11 is 15/2
  In the same way 11 and 37/2 is 15/2
  Now to get next number in series add 18 1/2 +15/2 then result is 21
• 11 years agoHelpfull: Yes(0) No(0)
• the series can be written as 3.5, 7.25, 11, 14.75,18.5, 20
  the difference is 3.75
  3.5+3.75=7.25
  7.25+3.75=11
  11+3.75=14.75
  ''
  ''
  20+3.75=23.75 or
• 7 years agoHelpfull: Yes(0) No(0)
• Difference is 3.75,so missing number is 23.75
• 5 years agoHelpfull: Yes(0) No(0)