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?

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.

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

my family used to fight over these for an hour monty hall problem caused quite a stir http://en.wikipedia.org/wiki/Monty_Hall_problem

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figure 100$ which was a previous debt and longer valid is incorrect... 49$ x 2 is the new debt. 100$ is old debt and no longer valid. 1$ shouldn't come into picture for the new debt 49$ x 2=98$ S, when u talk bout 100$, you are allowed to speak bout 1$ of yours.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..

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)

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

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!