I'm posting one puzzle, riddle, math, or statistical problem a day. Try to answer each one and post your answers in the comments section. I'll post the answer the next day. Even if you have the same answer as someone else, feel free to put up your answer, too!
Four gentlemen (Adam, Bill, Chuck, and Dan) went to an expensive restaurant to dine. They checked their coats, hats, gloves, and canes at the door (each of the gentlemen had one of each). But when they checked out, there was a mix up, and each of the men ended up with exactly one article of clothing (a pair of gloves is considered a single article of clothing) belonging to each one of the four. Adam and Bill ended up with their own coats, Chuck ended up with his own hat, and Dan ended up with his own gloves. Adam did not end up with Chuck's cane. State whose coat, hat, gloves, and cane each of the gentlemen ended up with.
A card-shuffling machine always rearranges cards in the same way relative to the original order of the cards. All of the hearts, arranged in order from ace to king, were put into the machine. The cards were shuffled and then put into the machine again. After this second shuffling, the cards were in the following order: 10, 9, Q, 8, K, 3, 4, A, 5, J, 6, 2, 7. What order were the cards in after the first shuffle?
There are 20 people in an empty, square room. Each person has full sight of the entire room and everyone in it without turning his head or body, or moving in any way other than the eyes. Where can you place an apple so that all but one person can see it?
I'm going to buy one-cent, two-cent, three-cent, five-cent, and ten-cent stamps. I'm going to buy four of each of two sorts, and three of each of the rest, and I have exactly enough to buy them -- just this handful of dimes. How many of each type am I going to buy?
Grass grows in a field at some rate r, where r is the units of grass grown per day. It is known that if 10 sheep are turned out in the field, the grass will be gone in 20 days. On the other hand, if 15 sheep are turned out in the field, the grass will be gone in 10 days. If 25 sheep are turned out in the field, when will the grass be gone?
Because I am by nature blind,
I wisely choose to walk behind;
However, to avoid disgrace,
I let no creature see my face.
My words are few, but spoke with sense;
And yet my speaking gives offence:
Or, if to whisper I presume,
The company will fly the room.
By all the world I am opprest:
And my oppression gives them rest.
BTW, do us all a favor and keep your answers clean.
All-ruling tyrant of the Earth,
To vilest slaves I owe my birth.
How is the greatest monarch blest,
When in my gaudy livery drest!
No haughty nymph has power to run
From me, or my embraces shun.
Stabb'd to the heart, condemn'd to flame,
My constancy is still the same.
The favourite messenger of Jove,
And Lemnian god, consulting strove
To make me glorious to the sight
Of mortals, and the gods' delight.
Soon would their altars' flame expire,
If I refus'd to lend them fire.