"All Riddles"


Two grandmothers

Two grandmothers, with their two granddaughters;


Two husbands, with their two wives;


Two fathers, with their two daughters;


Two mothers, with their two sons;


Two maidens, with their two mothers;


Two sisters, with their two brothers;


Yet only six in all lie buried here;


All born legitimate, from incest clear.  How?

Two widows each had a son, and each widow married the son of the other and then each had a daughter
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Two hospitals

A certain town is served by two hospitals. In the larger hospital, about 45 babies are born each day. In the smaller one, about 15 babies are born each day. Although the overall proportion of girls is about 50%, the actual proportion at either hospital may be greater or less on any day. At the end of a year, which hospital will have the greater number of days on which more than 60% of the babies born were girls?

The answer is 2: the smaller hospital. The Law of Large Numbers says:

The more people we survey, the more accurate the result.

Larger samples are better.

In this case, the number of children born each day is a random sample of the number of children born in a year. There is much more deviation in a small (daily, in this case) sample than over an entire year. Similarly, there will be more deviation in a sample of size 15 than in one of size 45. Even though both hospitals will have about 50% girls over the year, the smaller hospital will have more days in which the number is higher than 60% (and more days when it is less than 40%). (Consider the extreme case of a hospital that has one baby a day. Every day will be either more than 60% girls (one) or less than 40% girls (zero).

People commonly and mistakenly believe that even very small samples will have the same composition as large ones. Remember this next time someone uses a small survey sample to "prove" something -- the results may be invalid!
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Keep Giving

What is it that you can keep after giving it to someone else?

A promise
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The man in the desert

A man is found in the middle of the desert, dead, with bruises, and what looks like a backpack around his shoulders. There are no footsteps leading to him, or car trails, or animal foot steps. There was no wind for the past week. How did this man get there, and what killed him?

His parachute did not open
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Four members of a band …

Four members of a band are walking to a night concert. They decide to take a shortcut, but must cross a bridge. Luckily they have one flashlight.


Because of the varying size of their instruments, it takes each member a different amount of time to cross the bridge – it takes the first person one minute, the second person two minutes, the third person five minutes and the fourth person ten minutes.


They must cross the bridge in pairs, travelling at the slower speed so if the one minute person went with the ten minute person, it would take a total of ten minutes.


Since there is only one flashlight, one person must come back across the bridge, then another pair can cross.


They only have 17 minutes to cross the bridge and still get to the concert on time. What order should they cross to get everyone across and get to the concert?

First, the one minute person and the two minute person must cross the bridge, for a total of two minutes. Then the one minute person should come back with flashlight - total of three minutes. The five minute person and the ten minute person cross together next, making the total thirteen minutes. Now the two minute person goes back and (total now fifteen minutes) and gets the one minute person and they cross together bringing the total to seventeen minutes.
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riddle piddle

you can open it and close it and sometimes slide.

it is a door.
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Nails and Feathers

If you have a pound of nails and a pound of feathers which one weighs more?

There weigh the same because there both are a pound.
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Four Jolly Men

Four jolly men sat down to play,

And played all night till break of day.

They played for cash and not for fun,

With a separate score for every one.

When it came time to square accounts,

they all had made quite fair amounts.

Now, not one has lost and all have gained -

Tell me now, this can you explain?

The four jolly men are members of an orchestra hired to play at a dance.
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12 tons

There is a bridge that is 7 miles long the center of the bridge can only hold 12 tons. Three mile away from the center of the bridge is a truck that weighs exactlly 12 tons. When the truck gets to the center of the bridge a flock of birds lands on the truck. Why doesnt the bridge break?

Because the truck wasted three miles of gas
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Who am I?

I am a ruler that cannot rule. Who am I?

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