Date: Jan 27, 1999 7:15 PM
Author: Brendan
Subject: Solution!!
Dear Helena,

I read your problem and have solved it straight away!

The key to the problem is being able to reduce the original number of

coins to 3...for obvious reasons.

I must warn you...I'm only fourteen so I may not be able to answer

what you really wanted.

However, I think one can determine the odd coin from 24 coins in four

weighings.

Weighing 1 = determine heavier 12coins

2 = determine heavier 6coins

3 = determine heavier 3 coins

4 = determine heaviest coin

One cannot determine the odd coin from 38 in 4 weighings. This is

because by the end of the third weighing one is left with four coins.

In a single weighing one cannot find one heavier coin.

I hope you find this useful.

Brendan