# Can you solve this? o.O

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

1. ### krzysiekzSenior 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?

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4. ### bk071Jr. Executive VIPJr. 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.

5. ### ryce889Regular Member

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that's an expensive shirt

• Thanks x 1
6. ### HostStageJr. VIPJr. 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. ### SahLElite Member

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\$97 = Shirt

\$1 = mom

\$1 = you.

97+3=100?

there is no missing \$1

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9. ### tomjerryhackerRegistered 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100\$ is old debt and no longer valid.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. ### GreyWolfExecutive VIPJr. 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. ### waimeng00Junior 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

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