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Number Puzzle #107

(1 votes, average: 3.00 out of 5)

August 2, 2014 by puzzler 12 Comments

5 11 6 9 13 18 11 20 21 25 16 ?

5 11 6 9
13 18 11 20
21 25 16 ?

Check your answer:-

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Click here to See SolutionHide
Answer is 31.
How?
Look at columns, difference between second column number to first column number is same as difference between third column number and second column number, i.e.

c[i+1] – c[i] = c[i+2] – c[i]

lets assume missing number is X, thus
20 – 9 = X – 20
X = 40 -9 = 31

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Comments

  1. Charls Jacob says

    September 21, 2014 at 4:26 pm

    31

    Reply
  2. jithu says

    August 25, 2014 at 1:30 pm

    first row – 5+11+6+9=31
    second row – 13+18+11+20=62
    third row – 21+25+16+”31″=93
    all the row difference 31

    Reply
  3. fivebee says

    August 6, 2014 at 10:57 pm

    ans is 31 when you read the columns up to down

    Reply
  4. gopal says

    August 5, 2014 at 5:05 pm

    5 (+6) 11 descending order (-1) 6 (+3) 9

    13 (+5) 18 11(+9) 20
    21 (+4)25 16 ?(+8)=24

    Reply
  5. gopal says

    August 5, 2014 at 4:59 pm

    24

    Reply
  6. deepak says

    August 5, 2014 at 12:04 pm

    31

    Reply
  7. Kalpana Walke says

    August 5, 2014 at 5:53 am

    3rd row, how come 5? please check again.

    Reply
    • fivebee says

      August 20, 2014 at 2:19 am

      Look at the columns, not the rows for the answer, silly.

      Reply
  8. Ajith Nair says

    August 4, 2014 at 12:13 pm

    31

    Reply
  9. drbassvanagowda gm says

    August 3, 2014 at 8:17 am

    31

    Reply
  10. mugdha kelkar says

    August 2, 2014 at 10:27 pm

    so ans is 31

    Reply
  11. mugdha kelkar says

    August 2, 2014 at 10:26 pm

    31 in 1st row 5+8= 13, 13+8=21 2nd row 7 is added,3rd row 5 is added so here 11 is added so 9+11=20, 20+ 11=31

    Reply

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