17 sheep

One more riddle, it's also a well-known one here, but I'm sure some of you have similar ones. :)
Enjoy it! The "real" Maths tasks will begin soon!

17 Sheep

Riddle from Amsterdam: nothing may be eaten!

A man is walking with a sheep, a head of lettuce and a wolf. He sees a river and sees a boat. The boat can only hold two things, but if he leaves the sheep with the wolf, the wolf will eat the sheep, so he can't do that, and if he leaves the sheep with the lettuce, the sheep will eat it. How can he get across the river without anything being eaten?



This riddle is handed in by Zakaria.

Riddle from Amsterdam

Here is another riddle from Amsterdam. Ismail is the one that handed it in.

You have a big barrel filled with oil. Beside that you also have two empty cans that can hold 3 litres of oil and 5 litres of oil. For a price winning competition you have to measure an amount of exactly 4 litres. How can you do that with these two cans?

Riddle from Amsterdam

Here is a spicy riddle from Bugra from Amsterdam:

A tortoise is walking home to his well deserved piece of lettuce after his long working day. The distance to its home is 10 km. Since tortoises aren't usually in a hurry, he decided to take a five-minute break after walking half of the distance. The tortoise repeats this: each time it has walked half the remaining distance it takes a five minute break before continuing.

Will this tortoise ever get home? Explain your answer!

Stepping through a recipe card!

You see Ismail going through a recipe card.
Would it (theoretically) be possible to let the whole class 2vt (12 students) step through this card? If so, how would you do that?

The Dancing Beans

In a pot, there are 75 white beans and 150 black beans. By the pot, there's a bag of black beans. A playful chef takes out the beans from the pot one by one like this: he randomly picks two beans- if at least one is black, he puts it in the black beans bag and the other one (regardless of its colour) back into the pot. If both beans he picked are white, he throws them away and puts a black bean from the bag into the pot.
Each time he does that, the pot holds fewer beans, and in the end only one bean is left in the pot. What is its colour?

Chocolates

Here is a short and (hopefully!) sweet riddle, since Christmas time is a time for sweets: if in a box there are 24 dark chocolates, 12 milk chocolates and 4 white chocolates, what is the probability I pick up a milk chocolate?
If I put my chocolate back into the box and take out another one, what is the probability I pick a milk chocolate again?
The image is created by Armand.

The first bite

Hello, this is the first riddle, to welcome everyone on our blog:
You have three boxes, labeled "Apples", "Oranges" and "Apples and oranges". You know all the labels are misplaced and you have to replace them correctly, after sampling only one piece of fruit from one of the boxes.
How will you do that?