$1
Math brain teasers require computations to solve.
What fifty (American) coins equal exactly one dollar?
Answer
40 Pennies, 2 dimes, and 8 nickels.
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Comments
Rado
Nov 01, 2001
 What about 45 pennies, 2 nickels, 2 dimes and a quarter? 
dewtell
Jul 31, 2002
 That also works. In general, you can substitute a quarter and 23 pennies (24 coins, 48 cents) for 6 nickels and 18 pennies (also 24 coins and 48 cents), but you can only do that once to the initial solution.
The key to this problem is to recognize that the average value has to be 2 cents per coin, so you need to group enough pennies with each larger coin to keep the average of each group at 2 cents per coin.

beetee
Aug 01, 2003
 THE US MINTED A 2CENT PIECE FOR SOME YEARS 1800'S 
canu
Jul 13, 2004
 Information on US 2cent coins: www.coinfacts.com/two_cents/two_cents_by_date.html 
Question_Mark
Oct 27, 2005
 If this was the UK, it would be:
40 1p's, 2 10p's, 8 5p's (£1). 
Question_Mark
Nov 02, 2005
 Wait! Here is the UK's more sensible option. 50 2p's . 
SPUTNIK2
Feb 06, 2006
 good one! 
Atropus
Feb 12, 2006
 2p coins sound like the way to go ^_^
My country (New Zealand) got rid of 2c coins in 19891990.
We are about to lose 5c coins also.
Then again, most transactions here are electronic. 
gorillazgirl
Jul 03, 2006
 that was fun!! 
rrn0rrnrrnY
Sep 08, 2006
 I agree with Rado, but don't mind that there isn't just one answer. I enjoyed thinking it out without it giving me a headache. Thanks for a good teaser! 
LeafFan4life
Mar 04, 2007
 E and Z are weid letters but when put togetherr they make ez and i dont know what ez means!! well ne way this one was easy 
eighsse
Sep 08, 2013
 The easiest way to solve this is to make a permutationhunting program. 
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