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16 Coins

Logic puzzles require you to think. You will have to be logical in your reasoning.


Puzzle ID:#33211
Fun:*** (2.79)
Difficulty:*** (3.05)
Submitted By:fishmedAus******mod




Johnny was given 16 coins by his older, somewhat meaner brother, Mark. He told him that he could keep them all if he could place all 16 on the table in such a way that they formed 15 rows with 4 coins in each row.

After 10 minutes, Johnny walked away with the coins and Mark, after complaining futilely to his mother, left with nothing.

How did Johnny place the coins?

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Sep 28, 2006

Too tough! I loved it, but I didn't get it even with the clue. And I hate using the clues in the first place!

Great teaser!
Sep 28, 2006

I did look at the hint to get myself started. I had a different possibility figured out, compared to your answer. It works on the same principal as your solution, but you will get 16 rows for 16 coins... with 4 coins in each row. I do suppose your answer is the correct one, though Dynamic teaser and reasonably tough.
Oct 07, 2006


I had almost this same problem on during a matth computition
Oct 09, 2006

damn, that was a tough one...! I had pentgrammas, pentagons arround the star, david stars and so on... put a star within a star... didn't think about that! Great!
Nov 29, 2006

Nov 29, 2006

Could you explain how you can get the 16 rows???
Dec 07, 2006

WOW!! you got me!!! one point for you
Jan 03, 2007

It was clever, but the hint gave it away.
(user deleted)
Jan 19, 2009

It would be better if the problem read as "15 lines of 4 coins" instead of "15 rows of 4 coins". Would make it less ambiguous.
Jan 30, 2010

Wow, I don't think I would have gotten this in a million years Very creative mind you got!
Dec 03, 2010

wow, that was hard! Would not have got it without the hint. Came to me after that, tho. Good one!
Dec 03, 2010

Definitely needed the hint. Good teaser.

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