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coins in a dark room
There is a room
In the room are 50 coins 18 of them are showing tails The rest are showing heads. In the dark without being able to tell which way up the coins are Sort then in to two groups With the same amount of heads showing in each group. answers on a post |
Re: coins in a dark room
I think you grab 25 coins and flip over 7 of them
have to work this out |
Re: coins in a dark room
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i outta be studying for a fluid mech. exam, but this riddle keeps distracting me... |
Re: coins in a dark room
{Ken starts warming up his vintage Cray 1}
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Re: coins in a dark room
Choose a common coin type, let's say you feel US dimes. Put the dimes in one group and the rest of the coins in a different group. Bingo, 2 groups of coins :p
EDIT: Oops, forgot about the heads up part. |
Re: coins in a dark room
Stand them on edge.
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Re: coins in a dark room
Jack has left the box :^)
some coins wont stand on their edge how bout, put 25 in your left pocket, and 25 in your right pocket? (no heads are showing in either pocket) |
Re: coins in a dark room
Ken took the money and ran^
The room is dark -> group anyway you want - neither group has any heads showing : zero == zero |
Re: coins in a dark room
as you pick up each coin, cut it in half
put the two halfs in separate piles or better yet, you get an elephant, a bowling ball, and 4 pounds of wax... |
Re: coins in a dark room
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i don't know the answer either its bothering me |
Re: coins in a dark room
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Re: coins in a dark room
Why don't you just turn on the light, and then flip over the coins?
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Re: coins in a dark room
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lol |
Re: coins in a dark room
I knew that, but then Ken said something about some elephant so I thought I was entitled to say something about the lights. :)
Was this a homework assignment or something? |
Re: coins in a dark room
I think I reasoned it out, I had the right idea on my first post, but the wrong number
the original pile has 32 heads up, so you take 32 from the pile and flip them over. That is your second pile. If you grabbed all 32 heads then there are no heads left in either pile if you grabbed 18 heads and 18 tales, then you left 18 heads in the first pile, and when you flip the second pile you have 18 heads in both piles if you grabbed 19 heads and 17 tales, then you left 17 heads in the first pile, and when you flip the second you have 17 heads and 19 tails it works for all combinations but I like the pocket answer better :^) |
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