## Maths Riddles

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### Maths Riddles

Maths can be fun too!
Build up interest in Mathematics by trying out some of these interesting Maths Riddles.

1) Missing dollar riddle

Three guests check into a hotel room. The clerk says the bill is \$30, so each guest pays \$10. Later the clerk realizes the bill should only be \$25. To rectify this, he gives the bellhop \$5 to return to the guests. On the way to the room, the bellhop realizes that he cannot divide the money equally. As the guests didn't know the total of the revised bill, the bellhop decides to just give each guest \$1 and keep \$2 for himself. Each guest got \$1 back: so now each guest only paid \$9; bringing the total paid to \$27. The bellhop has \$2. And \$27 + \$2 = \$29 so, if the guests originally handed over \$30, what happened to the remaining \$1?

Try it out before checking out the solution at http://en.wikipedia.org/wiki/Missing_dollar_riddle

mathtuition88
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### Re: Maths Riddles

mathtuition88 wrote:Maths can be fun too!
Build up interest in Mathematics by trying out some of these interesting Maths Riddles.

1) Missing dollar riddle

Three guests check into a hotel room. The clerk says the bill is \$30, so each guest pays \$10. Later the clerk realizes the bill should only be \$25. To rectify this, he gives the bellhop \$5 to return to the guests. On the way to the room, the bellhop realizes that he cannot divide the money equally. As the guests didn't know the total of the revised bill, the bellhop decides to just give each guest \$1 and keep \$2 for himself. Each guest got \$1 back: so now each guest only paid \$9; bringing the total paid to \$27. The bellhop has \$2. And \$27 + \$2 = \$29 so, if the guests originally handed over \$30, what happened to the remaining \$1?

Try it out before checking out the solution at http://en.wikipedia.org/wiki/Missing_dollar_riddle

I remember this to be an age-old question. First came across this (or a similar one but perhaps background different) one probably about 35 yr ago when I was in pri sch...

atrecord
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### Re: Maths Riddles

Was also puzzled by the missing \$1 when i read it earlier in the afternoon.
Now it suddenly becomes crystal clear... they paid \$27, got back \$3, total is \$30. The \$2 that the staff kept comes from the \$27 .

The thing with me is, ask me again in a few weeks time and i will again go why huh?

CloudeeDaz
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### Re: Maths Riddles

The Monty Hall Problem

CloudeeDaz
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### Re: Maths Riddles

CloudeeDaz wrote::smile:
The Monty Hall Problem

I really like the Monty Hall Problem too, it is interesting and surprising!

mathtuition88
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### Re: Maths Riddles

23 people. In a room of just 23 people there’s a 50-50 chance of two people having the same birthday. In a room of 75 there’s a 99.9% chance of two people matching.
True or false?

It sounds too amazing to be true (since there are 365 days a year), but it really is!

Visit http://betterexplained.com/articles/und ... y-paradox/ to see the reasoning behind it.

mathtuition88
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