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Number Puzzle #28

(15 votes, average: 3.07 out of 5)

March 28, 2013 by puzzler 12 Comments

 

IF 1+2 = 3 3 + 4 = 21 5 + 6 = 55 Then 4 + 5 = ?

IF 1+2 = 3
3 + 4 = 21
5 + 6 = 55
Then 4 + 5 = ?

See AnswerHide Answer

Answer is 36

Explanation:
1 + 2 => (1)^2 + (1*2) = 3
3 + 4 => (3)^2 + (3*4) = 21
5 + 6 => (5)^2 + (5*6) = 55
Thus 4 + 5 => (4)^2 + (4*5) = 36

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Comments

  1. Jayshree Chokshi says

    August 23, 2016 at 2:31 pm

    36

    Reply
  2. Maysue Hadi says

    August 4, 2016 at 12:47 pm

    Hi all, may you all help me with this . Thanks

    2 + 5 = 7
    3 + 6 = 4
    4 + 7 = 21
    5 + 8 = -32
    6 + 9 = ???

    Reply
  3. Lavimanasi says

    June 26, 2014 at 10:12 am

    36

    Reply
  4. sunny says

    May 28, 2014 at 9:24 am

    i think defozo is correct

    Reply
  5. Rajender Singh says

    March 29, 2014 at 7:22 pm

    36

    Reply
  6. Defozo says

    May 27, 2013 at 7:28 pm

    I think it could be even:
    1+2=3 (3*1=3)
    3+4=7 (7*3=21)
    5+6=11 (11*5=55)
    Then 4+5=9 (9*7=63)

    Reply
    • puzzlersworld says

      May 28, 2013 at 3:25 am

      Last statement should be 9*4 = 36 🙂

      Reply
  7. Kimisama says

    May 15, 2013 at 1:31 pm

    3 + 4 => 3*(3+4) = 21 GREAT !!!
    But 3+4 = 12 and 12 *3 = 36
    36 != 21 I think

    Reply
    • Kimisama says

      May 15, 2013 at 1:33 pm

      Sorry, I see bad.
      It’s “+” not “*”

      Reply
      • puzzlersworld says

        May 16, 2013 at 5:26 am

        @2ec15b5af274b68408e6d0e050c2c7dd:disqus it happens, thats why these are puzzles, thanks for your comment.

        Reply
  8. Gokul S Rathore says

    March 31, 2013 at 4:50 pm

    it can solved also like below:
    1 + 2 => 1*(1+2) = 3
    3 + 4 => 3*(3+4) = 21
    5 + 6 => 5*(5+6) = 55
    Thus 4 + 5 => 4*(4+5) = 36

    Reply
    • puzzlersworld says

      April 1, 2013 at 4:20 pm

      @facebook-100001129396313:disqus , Yups it looks better and easy to understand, thanks for sharing

      Reply

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