Forehead Numbers Brain Teaser
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have things to accomplish...must stop doing brain teasers
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Got it in 15 minutes.
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I feel so proud that this is the only one I could get!
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All of your other videos made me think a lot before I got it, and sometimes I didn't get it, but I got this one instantly.
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Yep...got it in a sec! Bring on some more! :)
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khanacademy produces excellent videos, beyond excellent. And guess what? They're free. Take your comments elsewhere. And it's you're* not your. I believe you are (or you're) searching for the free English videos, Einstein.
ekim051084 2 years ago 12
@kskthesmart This problem is not "100% wrong". He never said that you could deduce your number given any combination of numbers fitting the parameters laid out in the beginning. The brain teaser involves only this specific case, where you see 20 and 30.
Interestingly, you can still deduce your number correctly even if you take away the requirement that the numbers be unique. The third person would know that if he was 10, and you were 10, then the second person would have known he was 20.
geistjagerin 7 months ago 7