Math Paradox

[samsoniks]

Ok, here is a little math paradox that i have ran into.​

I was hungry and didn't have any money on me so I borrowed a $100 from a Bob.

On the way to the shop I lost the $100. Then I met my friend Sarah and borrowed $50.

I went to the shop and bought 2 chocolate bars, each one costing $10.

So i had $30 left.

I gave those $30 to Bob.

That means I owe him $70 more, plus i owe Sarah $50.

That makes $120, plus the 2 chocolate bars (each one costing $10) = $140

So where did the $10 go?​

​

The money was actually 90% lower than on this post, the sums ware made bigger for easier understanding.

 

[Swayne]

I think you lost the $10 like you did the $100


But here is what I got.

-100 owed to Bob
-50 owed to Sarah
-20 candy bars
-170 total debt
+50cash
-120


-50 owed to sarah, -70 owed to bob = -120

cash given to bob +30 cash, candy bars +20= +50

Nice Riddle!

 

[Fullmetal]

I hate these, yet love them at the same time.

 

[Gypsy]

lol - you can't add debits and credits like that.

Of the $150 you borrowed, you pay back $30, so you only have to account for the other $120. $100 of that is lost, and the other $20 went to candy.

 

[Fishy64]

[ame]http://www.youtube.com/watch?v=Lz8KPw-u1U0&feature=related[/ame]
watch this and become a math genius

 

[Raul Tha Monk]

Mah head

 

[Liliana]

Let's look at this in specific quantities.
The total amount owed is $150.
We take away $30 that was paid back, leaving us with $120 owed. Note that we only had $50 at the time, meaning we have $20 for $120 owed.
This $20, instead of being paid for what was owed, was spent on candy bars. So we have $0 and owe $120. $120 = $70 (what we now owe Bob) + $50 (what we now owe Sarah).
We never had $150 at any time, nor even $100 at any relevant time, only $50.

You see, this so-called "paradox" is really caused by adding together numbers that are irrelevant to each other.