Can You Solve This Brain Teaser?

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Last night I spent the evening with some of my family who live nearby. I cooked a big pot of chicken and sausage gumbo, and we had a fantastic time catching up.

As I sat down on the couch after devouring a sugar cookie for dessert, my uncle handed me one of those big legal note pads. On it was a brain teaser that a friend had sent him via email. In my sugared brain fog, I worked through it and thought I would share it with you.

Look at the following series of numbers and determine which number goes in place of the question mark.

 

2,3,10

3,4,21

4,5,36

5,6,55

6,7, ?

 

You can post your answers in the comments below, and then check the solution to see if you were correct.

If you enjoy these teasers, please share them with your friends and family by clicking the Blue Share Buttons below. I appreciate your support!

Erin Matlock About the author, Erin Matlock
Erin Matlock is the CEO of Brain Pages, Inc, a media company specializing in the promotion of brain focused resources and professionals. Along with heading up BRAIN PAGES, the company's brain friendly directory and online community, she serves as Founder and Editor in Chief of BrainTraining101.com and TheBrainChannel.com.

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161 Comments On This Post

  1. 78

    Reply
  2. 78

    Reply
  3. easy stuff… 78

    Reply
  4. 78

    Reply
  5. Actually you can just add 4 to the last number in each sequence. Answer is still 78.

    Reply
  6. I got the pattern in less than 10 seconds but screwed up multiplying (6+7)*6. Got 252 after multiplying 6*7 and again by 6, lol.

    Reply
  7. the answer is 78.

    Reply
  8. 78, I got this very fast, I’ve noticed the 10, and the 21, and then, all the things came into my mind

    Reply
  9. The answer is 78. I feel so smart. lol

    Reply
  10. 78

    Reply
  11. The answer is 78 because the pattern is:
    2+3=5*2=10
    3+4=7*3=21
    4+5=9*4=36
    5+6=11*5=55
    6+7=13*6=78
    the answer has to be 78

    Reply
  12. i got the answer 78 tbh wasn’t that hard i was clearing out my inbox and i was going through my old emails when i found the teaser. The pattern was pretty clear :) 6 + 7 = 13 * 6 = 78

    Reply
  13. 78

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  14. 2+3=5. multiplying this with 1st term(2) we get 10.
    likewise 3+4=7, 7*3=21
    4+5=9, 9*4=36
    5+6=11, 11*5=55
    6+7=13, 13*6=78
    so the answer we got is 78

    Reply
  15. pattern is first value + second value = result X first value
    6+7 = 13 (6) = 78

    Reply
  16. 2+3=5*2=10
    3+4=7*3=21
    4+5=9*4=36
    5+6=11*5=55
    6+7=13*6=78
    so the answer is 78.

    Reply
  17. The answer is 78

    Reply
  18. 2+3=5;5*2=10
    3+4=7;7*3=21
    4+5=9;9*4=36
    5+6=11;11*5=55
    6+7=13;13*6=78

    Reply
  19. 2+3=5, 5*2=10
    3+4=7, 3*7=21
    4+5=9, 4*9=36
    5+6=11, 5*11=55
    6+7=13, 6*13=78
    so, ?=78

    Reply
  20. 2*3=6+(2*2)=10
    3*4=12+(3*3)=21
    4*5=20+(4*4)=36
    5*6=30+(5*5)=55
    6*7=42+(6*6)=78

    Reply
  21. 78

    Reply
  22. 60

    Reply
  23. answer is 78

    Reply
  24. 78 (6+7= 13 X6)

    Reply
  25. 23

    Reply
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