Sharp Brains: Brain Fitness and Cognitive Health News

Neuroplasticity, Brain Fitness and Cognitive Health News

Icon

Brain Teaser: Dr. Nasty’s Giant Cube

Here is anoth­er mind-ben­der cre­at­ed by Wes Car­roll for the Sharp­Brains read­ers.

Pre­sent­ing …
Dr. Nasty’s Giant Cube

Dif­fi­cul­ty: HARDER
Type: HYBRID (Logic/Spatial)

Ques­tion:
The dia­bol­i­cal Dr. Nasty has turned his Growth Ray on a per­fect cube that used to mea­sure one foot on a side. The new larg­er cube has twice the sur­face area of the orig­i­nal. Find the vol­ume of the larg­er cube.

cube brain teaser

Click to read Hint #1.

Click to read Hint #2.

Click to read Hint #3.

Click to read Hint #4.

Click to read the Solu­tion and Expla­na­tion.

Leave a Reply...

Loading Facebook Comments ...

16 Responses

  1. Masa says:

    Damn, this is propably the eas­i­est puz­zle you have ever post­ed here.

  2. Caroline says:

    Masa, I’m glad to hear you’re sharp enough to get this one so quick­ly! Not every­one else has. We’ll post anoth­er one tomor­row — come back and see how you do!

  3. Sandman says:

    I don’t like the expla­na­tion beca­sue it relies on rules of thumb. It’s simlple to go to the fun­da­men­tal equa­tions for SA and V. Each side is 1 X 1. Times 6 sides = 6. Dou­ble that is 12. Solve for side length gives √2. V = side length cubed. 2*√2.

  4. Caroline says:

    Sand­man,

    Thanks for anoth­er, very valid expla­na­tion!

  5. r says:

    gig­gi­ty.

  6. Alana says:

    It is annoy­ing to have to down­load the answers and hints to Word. Can’t you make it part of the web­site?

  7. Alvaro says:

    Hel­lo Alana, we stopped using this Word sys­tem to dis­play answers, giv­en feed­back like yours. The answers to most teasers are now eas­i­er to find. Thanks.

  8. Beck says:

    To use the basic vol­ume equa­tion V = H x L x W,

    V = √2 x √2 x √2

  9. Sheri says:

    I agree with Alana, it is very annoy­ing to down­load the hints and answers and usu­al­ly I don’t. It would be much bet­ter if you could just click and read!!

  10. Alvaro says:

    Hel­lo Sheri, OK, let us think how to make it eas­i­er to check the answer. Thanks for the feed­back.

  11. Mitch says:

    Yea i found this one very easy.

  12. fluffychenille says:

    Just cre­ate anoth­er linked “web­page” for the answer.…the down­load is annoy­ing.

  13. tayler says:

    i love dr. nasty =)

  14. mathlete says:

    tech­ni­cal­ly you cant dou­ble a ‘per­fect’ cube…the answer is irrational…triple a cube yes , nev­er double…well i think so any­way

  15. R V says:

    The old­er side is 1 Foot.

    As the new area of one side is now 2 square feet, then one side becomes √2 feet (or 1.414 feet). Now the Vol­ume is:

    √2 x √2 x √2 = 2√2 = 2.828 cubic feet.

Leave a Reply

Categories: Brain Teasers

Tags: , , , , , ,

All Slidedecks & Recordings Available — click image below

Search for anything brain-related in our article archives

About SharpBrains

As seen in The New York Times, The Wall Street Journal, BBC News, CNN, Reuters, and more, SharpBrains is an independent market research firm and think tank tracking health and performance applications of brain science.