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Riddle:

Suppose you want to send in the mail a valuable object to a friend. You have a box which is big enough to hold the object. The box has a locking ring which is large enough to have a lock attached and you have several locks with keys. However, your friend does not have the key to any lock that you have. You cannot send the key in an unlocked box since it may be stolen or copied. How do you send the valuable object, locked, to your friend - so it may be opened by your friend?

Answer:

Send the box with a lock attached and locked. Your friend attaches his or her own lock and sends the box back to you. You remove your lock and send it back to your friend. Your friend may then remove the lock she or he put on and open the box.

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Riddle:

Some say we are red, some say we are green. Some play us, some spray us.

What are we?

Answer:

Pepper.

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Riddle:

A student zips on his scooter to ride to the train station to get to college. His home is close to two stops; the first one is a mile from home, and the second is two miles from home in the opposite direction. In the morning, he always gets on at the first stop and in the afternoon, he always gets off at the second one.

Why?

Answer:

The sations and his home are on a hill, which allows him to ride down easily on his scooter.

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Riddle:

The title of the problem tells you how to approach these four questions.

(A).  A bus leaves Moscow for Tula at noon. An hour later a cyclist leaves Tula for mosco, moving slower than the bus. When the bus and cyclist meet, which one of the two will be farther from Moscow?

(B). Which is worth more: a pound of $10 gold peices or half a pound of $20 gold pieces?

(C). At six o'clock the wall clock struck 6 times. Checking with my watch, I noticed the time between the first and last strokes was 30 seconds. How long will the clock take to strike 12 at midnight?

(D). Three swallows fly outward from a point. When will they all be on the same plane in space?

Now check the answers. Did you fall into any of the traps which lurk in these simple problems?

Answer:

(A). Neither

(B). A pound of metal is always more than half a pound of the same metal.

(C). Six strokes took 30 seconds, therefore 12 strokes will take 60 seconds. But when the clock struck six, there were only 5 intervals between strokes, and each interval was 30/5=6 seconds. Between the first and twelfth strokes there will be 11 intervals of 6 seconds each, therefore 12 strokes will take 66 seconds.

(D). There is always a plane that contains any 3 points 

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Riddle:

A man phoned his daughter to ask her to buy a few things he needed for a trip. He told her she would find enough dollar bills for the purchase in an envolope on his desk. She found the note with 98 written on it.

In the store she bought $90 dollars worth of things, but when it was time to pay she not only did have $8 left over but she was short.

By how much and why?

Answer:

(A). $4. She had read 86 upside down.

(B). Turn 9 upside down and exchange it with the 8. Both columms will add to 18.

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Riddle:

As I traveled up and down our great glorious country, I found myself in a place where the tempature goes up sharply in the day and down at night. This had an effect on my watch, I noticed it was 1/2 a minute faster at nightfall, but at dawn it had lost 1/3 minute, making it only 1/6 minute fast.

One morning- May 1- my watch showed the right time. By what date was it 5 minutes faster?

Answer:

In 24 hours the watch gained 1/2-1/3= 1/6 minute. It would seem it would be 5 minutes fast in 5 X 6= 30 days; that is,the morning of May 31. But already on the morning of May 28 the was 27/6= 4 1/2 minutes fast. At the close of the day the watch gained 1/2 minute more, so it was 5 minutes fast on may 28.

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Riddle:

(A) Use two digits to make the smallest possible positve intiger.

(B) Five 3s can express 37:  37=33+3+3/3

Find another way to do it.

(C) Use six identical dgits to make 100. (Several solutions are possible.)

(D) Use five 4s to make 55.

(E) Use four 9s to make 20.

Answer:

(A) 1 X 1; 1/1;2/2;ect....;1-0;2-1;and many others.

(B) 37=333/3X3; 37=3 X 3 X 3 + 3/.3

(C) 99 + 99/99; 55+55- 5- 5; (666-66)/6

(D) 44 + 44/4=55.

(E) 9 + 99/9=20.

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Riddle:

A great banquet was prepared for a Roman emperor and his courtiers. 22 Dormice, 40 Larks' Tongues, 30 Flamingos and 40 Roast Parrots were served.

How many portions of Boiled Ostrich were served?

Answer:

42. Each vowel is worth 2 and each consonant 4, so Dormice gives 22, ect.

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Riddle:

In yon vast field of cultivated space, I there am found with members of my race; Decapitate me - if you've no objection - You then will find what brings me to perfection; Take one more cut, and then you'll plainly see What Iam destined, day by day, to be. What am I?

Answer:

WHEAT
  HEAT
   EAT

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Riddle:

My first is often at the front door. My second is found in the cereal family. My third is what most people want. My whole is one of the United States.

Answer:

Matrimoney. (mat + rye + money). Matrimony is certainly a "united state"!

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