Monday 31 March 2014

How Many Animals

A farmer keeps three types of animals on his farm: cows, pigs and horses. Can you guess how many of each animal he has based on the following information?

1) Three of the animals are NOT cows
2) Four of the animals are NOT pigs
3) Five of the animals are NOT horses


ANSWER3 cows, 2 pigs and 1 horse.

EXPLANATION: You can use algebra to solve the problem:
1) Pigs + Horses = 3
2) Cows + Horses = 4
3) Cows + Pigs = 5

Use the first two equations and isolate for Horses:
Horses = 3 - Pigs
Horses = 4 - Cows
therefore 3 - Pigs = 4 - Cows

Replace Cows in the above equation with 5 - Pigs (from equation 3):
3 - Pigs = 4 - (5 - Pigs)
3 - Pigs = 4 - 5 + Pigs
3 - Pigs = -1 + Pigs
4 = 2 × Pigs
Pigs = 2

Replacing Pigs with 2 in equations 1 and 3 will give you the number of Horses and Cows.



Measure

You are given three jugs with a capacity of 8, 5 and 3 litres respectively. The 8-litre jug is filled to the top with water whereas the other two jugs are empty. You are asked to divide the 8 litres of water into two equal parts of 4 litres and in as few steps as possible.

Each step involves pouring water from one jug into one of the other two jugs. Note: the jugs are not calibrated (i.e. there are no line markings). Therefore, in each step one of the jugs needs to be completely emptied or completely filled in order to know exactly how much water has just been poured.

How many steps do you need and what are the steps?



ANSWERIt is possible to achieve the task with the following 7 steps:

Start800
Step 1350
Step 2323
Step 3620
Step 4602
Step 5152
Step 6143
Step 7440

Tuesday 4 March 2014

Puzzles #3

#1

What gets wetter and wetter the more it dries?
A towel.

#2

You throw away the outside and cook the inside. Then you eat the outside and throw away the inside. What did you eat?
An ear of corn.


#3

What goes up and down the stairs without moving?
A rug.

#4

What can you catch but not throw?
A cold.

#5

I can run but not walk. Wherever I go, thought follows close behind. What am I?
A nose.

#6

What's black and white and red all over?
A zebra painted red.

#7

What goes around the world but stays in a corner?
A stamp.

#8

I have holes in my top and bottom, my left and right, and in the middle. But I still hold water. What am I?
A sponge.

#9

Give me food, and I will live; give me water, and I will die. What am I?
Fire.


#10

The man who invented it doesn't want it. The man who bought it doesn't need it. The man who needs it doesn't know it. What is it?
A coffin.

Monday 3 March 2014

Riddles # 2

Riddle: Weight in my stomach,
trees on my back,
nails in my ribs,
it's feet I lack.

What am I?


Answer: A ship.


Riddle: I'm heavy but not backwards.

What am I?


Answer: The word 'ton', spelled backwards it is 'not'.


Riddle: What's always coming, but never arrives?


Answer: Tomorrow!


Riddle: I wear a red coat and have a stone in my throat.

What am I?


Answer: A cherry.

Riddles # 1

Riddle: I have four wings, but cannot fly.
I never laugh and never cry;
On the same spot I'm always found, toiling away with a little sound.

What am I?

Answer: A fan.

Riddle: A hobo picks up cigarette butts from the ground and can make a cigarette with 4 butts. If he finds 16 cigarette butts, how many cigarettes can he make?

Answer: 5. He makes 4 cigarettes with the 16 butts. Then he smokes them and has 4 more butts to make another cigarette.

Riddle: We hurt without moving.
We poison without touching.
We bear the truth and the lies.
We are not to be judged by our size.

What are we?

Answer: Words.

Riddle: An ant gets onto one end of a tight rope that is 1 meter long. The ant is traveling at 1 centimeter per second, but the entire rope is being stretched an extra 1 meter a second (it can be stretched forever).

Will the ant ever reach the other end of the rope?

Answer: He will reach the end of the rope eventually. Once he gets onto the rope, the rope behind him also stretches, so this must also be accounted for.

Wednesday 8 January 2014

Simple Riddles

  • What has a face and two hands but no arms or legs? A clock

  • What five-letter word becomes shorter when you add two letters to it? Short

  • What word begins and ends with an ‘e’ but only has one letter? Envelope

  • What has a neck but no head? A bottle

  • What type of cheese is made backwards? Edam

  • What gets wetter as it dries? A towel

  • Why did the boy bury his flashlight? Because the batteries died.

  • Which letter of the alphabet has the most water? The C

  • What starts with a ‘P’, ends with an ‘E’ and has thousands of letters? The Post Office!

  • What has to be broken before you can use it? An egg

  • Why can’t a man living in New York be buried in Chicago? Because he’s still living!

  • What begins with T, ends with T and has T in it? A teapot

  • How many letters are there in the English alphabet? There are 18: 3 in ‘the’, 7 in ‘English’ and 8 in ‘alphabet’.
  • Which month has 28 days? All of them of course!