The $97 shirt revisited …

Let’s revisit the problem …

You saw a shirt for $97.

Having no cash, you borrowed $50 from your mum and $50 from your dad.

$50 + $50 = $100.

You bought the shirt, and had $3 change.

You gave your dad $1 and your mum $1. You have a dollar in your pocket.

You now owe your mum $49 and your dad $49.

$49 + $49 = $98. Add the $1 you still have = $99.

Where is the missing dollar?

This is apparently hurtling around the internet to the puzzlement of many in their late teens to early twenties.

The first point to be made is that if you have no money, what you need from your shirt is that it make a good impression at your next job interview … $25 at target.

Secondly, if you have $3 in your pocket, no matter how it came to be there, and you give $1 to your Mum and $1 to your Dad you will have $1 left … the world does not owe you an extra dollar.

So let’s take it from the beginning …

You borrow $50 each from Mum and Dad. You have $100 in your hand.

You spend a ridiculous amount on a shirt and now you have a shirt in one hand and $3 in the other.

You give two dollars away, you are left with $1, a shirt and, because you reduced your $100 debt by $2, a debt of $98 … what else did you expect?

The puzzle evaporates in the face of logic but on first reading it has a certain pull … because it invites you to do a sum that simply isn’t itself logical and leads to a wrong answer.

If you saw straight through the puzzle congratulations.

If you didn’t you may need to temper your expectations at the job interview.

If you wrote the puzzle there’s a guy in Canberra named Wayne Swan who needs a hand finding a few missing dollars.

Shirts, $97 …

You saw a shirt for $97.

Having no cash, you borrowed $50 from your mum and $50 from your dad.

$50 + $50 = $100.

You bought the shirt, and had $3 change.

You gave your dad $1 and your mum $1. You have a dollar in your pocket.

You now owe your mum $49 and your dad $49.

$49 + $49 = $98. Add the $1 you still have = $99.

Where is the missing dollar?