Can you solve this? o.O

Discussion in 'BlackHat Lounge' started by krzysiekz, Aug 16, 2011.

  1. krzysiekz

    krzysiekz Senior Member

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    You saw a shirt for $97. You didn?t have the cash, so you borrowed $50 from your mum and $50 from your dad = $100. You bought the shirt, and had $3 change. You gave your dad $1 and your mum $1 and kept the other $1 for yourself. Now you owe your mum $49 and your dad $49. 49+49 = 98 + your $1 = 99. Where is the missing $1?
     
  2. larrydetuvi

    larrydetuvi Regular Member

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    In your pocket..
     
  3. syngenetic

    syngenetic Guest

    [​IMG]
     
  4. bk071

    bk071 Jr. Executive VIP Jr. VIP

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    Well in reality you may have borrowed $50 from each parent although out
    of each $50 you only spent $48.50 from each.

    $48.50 x 2 = $97 and you have $3 out of the hundred remaining
    If you gave Mom $1 and Dad $1 and the son kept the other Dollar

    I'd say mathematically it's all good!
    And you my friend need to revisit Math 101...lol j/k

    I love brain teasers. :D
     
  5. ryce889

    ryce889 Power Member

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    that's an expensive shirt
     
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  6. HostStage

    HostStage Jr. VIP Jr. VIP

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    Well actually you didn't settle the money math properly ;)

    You borrow 100$ no matter how many slices of it.

    You keep 1$ so you owe 99$ to your mum and dad

    you give them 1$ each so you owe 97$ / 2 = 48.5 ;)

    What you did is you count 4 in giving back instead of 3.

    Good mind game ;)
     
  7. SahL

    SahL Elite Member

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    $97 = Shirt

    $1 = mom

    $1 = Dad

    $1 = you.

    97+3=100?

    there is no missing $1 :p
     
  8. tony-raymondo

    tony-raymondo Junior Member

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  9. tomjerryhacker

    tomjerryhacker Registered Member

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    Old Trick to confuse..

    But in real Math.. the point of adding 49$ debt each and your Own 1$. and expecting it to equal to a round figure 100$ which was a previous debt and longer valid is incorrect...

    49$ x 2 is the new debt.
    100$ is old debt and no longer valid.
    1$ shouldn't come into picture for the new debt 49$ x 2=98$
    S, when u talk bout 100$, you are allowed to speak bout 1$ of yours. else its invalid entity..

    Hope that explains.. :)
     
  10. GreyWolf

    GreyWolf Executive VIP

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    You're right in that after giving the parents back $1 each, you have now only borrowed $98. (49+49=98).

    The rest of your equation though is an error in logic. There is no missing dollar.

    You gave your parents back $2 so that balances it back to the $100 borrowed. (98+2=100)

    The extra dollar you keep isn't an addition to the 98 it's a subtraction. You've now borrowed $98, kept $1 for yourself and used the rest to buy the $97 shirt. (98-1=97)
     
  11. waimeng00

    waimeng00 Junior Member

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    Good Explanation by GreyWolf.

    Money That You Owe Your Dad & Mum
    100 - 2 = 49 + 49 = 98

    Value That You Have in Hand (Shirt & $1)
    97 + 1 = 98

    You have no money in the begining. After you borrowed money, buy shirt, return some money back to your parents, you get $98 value in hand, and you owe your parents $98.

    There's no money loss.
    98 = 98
     
  12. moundown

    moundown BANNED BANNED

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    You borrowed 50$ from both parents. You bought the shirt (97$). So that means you owe to your parents 1.50x2 . But you gave them 1x2 . So that means the remaining 0.50x2 is the dollar missing.

    But wait, you kept 1$ ..... Damn ..... At the time of writing I thought I was right!