What’s Your Brain Profile? Take the Weekly Challenge!

How closely do you pay attention? Test yourself on your ability to focus (or not!). Every Tuesday, we’ll release a new brain challenge. Complete all 12 episode challenges to reveal your total brain profile.

Here’s a little sneak peek at one of the questions… there’s only three, so don’t linger too long! The idea is to answer as fast as you can!


This week, we have TWO brain challenges that correspond with next week’s TWO back-to-back premieres of the brand-new season of Brain Games. After you test your focus, explore what makes your brain tick when it comes to time. Are you sharp like a human buzz-saw? Or as focused as a swarm of drunken bees?

Take the first two brain challenges and find out! And be sure to check back next week when we release the next challenge.

Don’t miss Brain Games next Monday, April 22nd, starting and 9P… we’re going to blow your mind.


  1. Lynn
    April 22, 2013, 10:00 am

    It doesn’t say if five machines were involved in the process with one shaping the wood, one making the erasers, etc … or if five machines are all making whole pencils simultaneously. Process one means a pencil a minute. Process two means one pencil per five minutes.

  2. John
    April 22, 2013, 9:17 pm

    What are you talking about

  3. suresh
    April 23, 2013, 6:50 am

    100 munites

  4. bilal khan
    April 26, 2013, 7:51 am

    it take only 5 minut because every one machine take one minutre for making one peencile

  5. Luis
    May 4, 2013, 1:33 am

    It doesn’t matter if it takes 5 machines to make one pencil or one that takes 5 minutes per pencil. you have 100 machines that makes 20 groups that produce one pencil a minute . Or one machine that makes a pencil per 5 minutes. the answer will always be 5 minutes. 20×5=100 or 100 slow machines that take 5 minutes to make one pencil. In 5 minutes you will have 100 pencils

  6. Natalie
    May 13, 2013, 10:37 pm

    therefore, they are equal fractions so whatever the answer to one is, that is the answer to the other as well. 5 minutes for each

  7. Malik Wasiq Amir
    May 17, 2013, 11:13 am

    According to my point of view answer of that question is 5 minutes

  8. shivani
    May 21, 2013, 3:01 am

    Every individual machine is making 1 pencil in 5 minutes. So let there be any number of machines working together time taken will be 5 minutes

  9. shivani
    May 21, 2013, 3:15 am

    HERE’S ANOTHER SUCH challenge
    If 10 wet clothes take 1hr to dry , how much time will 34 wet clothes take to dry?

  10. james
    May 29, 2013, 3:29 pm

    Posted by Meg Gleason of National Geographic Channels in Brain Games on

  11. Pognakvorn
    June 1, 2013, 11:15 am

    In my opinion the answer is 5minutes.

    5 machines spend 5minutes to produce 5pencils.
    It means1 machine spends 5minutes to produce 1pencil.
    so 100 machines would spend only 5minutes to produce 100pencils.

  12. dAn
    United States
    June 4, 2013, 1:24 pm

    “It is better to make people THINK you are stupid, than open your mouth and remove all doubt”……you know who you are, hehe!

  13. mohsin
    June 5, 2013, 3:12 am

    5 minutes

  14. Kevin Middleton
    New Zwealand
    June 6, 2013, 2:20 pm

    Less than a 1 minit if I am running the machine…..duh

  15. Gaurav Sarkar
    September 21, 2013, 5:13 pm

    According to my opinion….. 5 mins…..

  16. Brad
    October 1, 2013, 9:17 pm

    I don’t know why this took me so long but yeah the answer is 5 minutes. There are some assumptions you have to make though:
    1) The machines are running simultaneously
    2) Each individual machine will produce a single pencil (this can be worked out from the problem)
    If it takes 5 minutes for 5 machines to produce 5 pencils, and they are running at the same time, then a single pencil will burst forth from each individual machine in 5 minutes.
    If you have 100 machines, and they’re running at the same time, and you want to produce 100 pencils, you know that in 5 minutes a single pencil will be produced from each machine. Therefore, when you have 100 machines running, it will only take 5 minutes to make 100 pencils.